Composition based organopolysiloxanes for application to thin-film substrate with a release coating

 

(57) Abstract:

Composition based organopolysiloxanes for application to thin-film substrate with a release coating contains unsaturated hydrocarbon group, branched organopolysiloxane, linear metallographically as a crosslinking agent and a platinum catalyst in an effective amount. As having unsaturated hydrocarbon groups organopolysiloxane contains a polymer with an average molecular weight of 9000 - 60000, which has at least 90% of organogram are methyl groups, the ratio between the number diagenetically of links and the number of points of divergence in average 15-40 at least one diorganodichlorosilanes link and a maximum of half of all trigonometrically links free from unsaturated residues, other diorganodichlorosilanes links have one unsaturated residue, the content of unsaturated residue is 0.2-1 mmol/g as a linear metallographically composition contains a polymer in which the number siloxanic links to mol more than the specified ratio between the number diagenetically of links and the number of points of divergence, which we of hydrogen, while having an unsaturated hydrocarbon group, branched organopolysiloxane and linear metallographically taken in an amount to provide a ratio between the number krampfadern groups of linear metallographically and the number of unsaturated hydrocarbon groups, branched organopolysiloxane, equal to 1.5 to 3.5. The composition allows to fully exploit the power of modern high-speed machines for coating. 4 C.p. f-crystals, 1 table.

The invention relates to materials to reduce the adhesiveness of the thin-layer substrates, in particular to the composition based organopolysiloxanes for application to thin-film substrate with a release coating.

Known composition based organopolysiloxanes for application to thin-film substrate with a release coating, including

(A) contains the associated silicon and remains ninasimone hydrocarbons organopolysiloxane whose viscosity is from 50 to -107Masek,

(B) contains at least three edges of craniodental organopolysiloxane,

(C) a catalyst based on a noble metal and, if necessary,

(G) additive that slows the reaction is further designated branching Tnand/or Qnand associated with the remnants of the unsaturated hydrocarbons of the silicon atoms Xm, the number of which is determined by the equations (a), (b) and (C)

(a) n+1m2 in the case of T-containing organopolysiloxane,

(b) (2n' + 1) m 2 in the case of Q-containing organopolysiloxane,

(C) [[(n + 1) + (2n' +1)-1] m 2 in the case of Q - and T-containing organopolysiloxane, and n means the number of 0-10, n' is a number of 0-10, and the sum n+n' is the number 1 -10,

and consisting of trigonometrically links end groups contain at least one unsaturated hydrocarbon residue (see EP N 0403890 A2, MKI: C 09 D 5/00, 1990).

The disadvantage of this structure is that the cure time is not entirely satisfactory and, thus, modern high-speed installation for coating is not economical to use.

The objective of the invention is to provide a composition based organopolysiloxanes for application to thin-film substrate with a release coating, which is faster utverjdaet and therefore allows you to fully use the power of modern high-speed machines for coating. In addition, more rapid curing should be carried out not only at ordinary temperatures, but when mn is locustville thin layer of the substrate.

The problem is solved by the proposed structure on the basis of organopolysiloxanes for application to thin-film substrate with a release coating containing having an unsaturated hydrocarbon group, branched organopolysiloxane, linear methylhydrosiloxane as a crosslinking agent and a platinum catalyst in an effective amount, due to the fact that as having an unsaturated hydrocarbon group, branched organopolysiloxane contains a polymer with an average molecular weight of from 9,000 to 60,000 of which at least 90% of organogram are metal groups, the ratio between the number diagenetically links number of points of divergence averages 15 to 40, at least one diorganodichlorosilanes link and a maximum of half of all trigonometrically links free from unsaturated residues, other diorganodichlorosilanes links have one unsaturated residue, the content of unsaturated residue is 0.2 - 1 mmol/g, and as linear methylhydrosiloxane contains a polymer in which the number siloxanic links to mol higher than the ratio between the number diagenetically links and the number IU the state with the silicon atoms of hydrogen, while having an unsaturated hydrocarbon group, branched organopolysiloxane and linear methylhydrosiloxane taken in an amount to provide a ratio between the number krampfadern groups of linear methylhydrosiloxane and the number of unsaturated hydrocarbon groups, branched organopolysiloxane, equal to 1.5 to 3.5.

In addition, the composition may also contain conventional, not directly involved in the reactions of addition of additives and excipients in amounts less than 5 wt.% in terms of composition.

The proposed composition is obtained by simple mixing of the individual components.

The composition has a very high rate of crosslinking, so that in particular when Mehanizovana the coating on the paper when the paper is removed from the rolls, is transported through the installation for coating and then through the installation for the heat treatment, it is possible to achieve a high speed blade.

An attempt to explain the high rate of crosslinking according to the invention is based on the assumption that it depends on very long in comparison with linear parts having unsaturated uglevodorodyonogo almost the entire length of kremneftoridy groups as crosslinking reagents, while extensive organopolysiloxane only end groups offer unsaturated hydrocarbon groups as crosslinking reagents. Due to the fact that the length of methylhydrosiloxane considerably exceeds the length of the linear plots of branched organopolysiloxanes, methylhydrosiloxane molecule finds multiple reactive end groups as the same branched organopolysiloxane molecules, and other branched organopolysiloxane molecules without the cost and time to the movement of molecules in the crosslinked mixture. The average number diorganiltsinkovye links (next: D-link) linear plots of branched organopolysiloxane is about half the ratio between the total number of D-links per molecule and the number of seats branching molecule, i.e., approximately 7 - 20. The length of the linear methylhydrosiloxane according to the invention is defined about at least double the number organosiloxane groups on the molecule.

Available from unsaturated residues of the end groups of the branched organopolysiloxane function as an internal plasticizer. The number of unsaturated residue free end groups can be managed e who should consist of a metal of groups. Organography remaining after taking into account the limit of unsaturated organogram may consist of Akilov from 1 to 14 carbon atoms, cycloalkyl or unsubstituted or substituted alkyl phenyl groups. Also valid are also a small number who are not at the end of alkenyl. The choice of these remaining organograph can affect the adhesive properties obtained on the basis of the proposed composition of the coatings. Large organography, however, lead to reduced mobility of the molecules in the crosslinked mixture and, thereby, to reduce the speed of the stitching. Therefore, according to the invention all organography excepting the end of unsaturated residues should preferably be a methyl group. Unsaturated hydrocarbon residues of branched organopolysiloxane can represent alkenyl with 2 to 8 carbon atoms, which may also be interrupted by oxygen, as, for example, -CH=CHCH2OCH2CH=CH2. Preferred are vinyl or allyl groups, in particular vinyl groups.

As places of branching is preferably used monoethanolamine links, i.e. trifunctionally siloxane links (hereinafter: T-links). They can also partially be the about the invention of one Q-link should be considered as a double branching point, i.e. as two T-link. Preferably not more than half the points of divergence should consist of Q-links, i.e., the ratio between the number of T-units and number of Q-links must be at least 2. Preferably organopolysiloxane contains at least 12 T-links.

Linear methylhydrosiloxane preferably have end trimethylsiloxy group. At least half of D-links must be directly related to the silicon atoms of hydrogen (group H(CH3)SiO). Preferably the number of groups is related directly to the silicon atoms of hydrogen, is 70-85% D-links. Preferably the number siloxanic chains on the molecule should not exceed double the ratio between the number of D-links and the number of points of divergence of organopolysiloxane. Linear methylhydrosiloxane with a large number siloxanic links preferably have a smaller relative number of D - links with directly linked to the silicon atoms of hydrogen in order for a given ratio between the number krampfadern groups and the number of unsaturated hydrocarbon groups in the mixture, the rate of crosslinking is not decreased because of too small number methylhydrosiloxane s, satisfying the above conditions, are, for example, the following structures:

[CH2CH(CH3)2SiO1/2]5[(CH3)3SiO1/2]2[(CH3)2SiO]200[CH3SiO3/2]5and

[(CH3)3SiO1/2]2[(CH3)HSiO]30[(CH3)2SiO]9or, respectively,

[CH2= CH(CH3)2SiO1/2]5[(CH3)3SiO1/2]4[CH2= CH(CH3)SiO]1[(CH3)2SiO] 280[CH3SiO3/2]7and

[(CH3)3SiO1/2]2[(CH3)HSiO]33[(CH3)2SiO]9and

[(CH3)3SiO1/2]7[CH2= CH(CH3)SiO]2[CH2= CH(CH3)2SiO1/2] 4[(CH3)2SiO]133 358...]CH2=SiO3/2]3[CH3SiO3/2]6or

[(CH3)3SiO1/2] 3[CH2= CH(CH3)2SiO1/2]7[(CH3)2SiO]120 320...[CH3SiO3/2]4[SiO2]2,

with appropriately selected methylhydrosiloxane.

The polymers of the above composition can be obtained by well-known specialist methods, for example, by hydrolysis of chlorine/P> Additives and auxiliary substances can be a modifier, complexing agents for catalyst or solvent.

Application of the proposed structure on a thin substrate, such as paper, by conventional means, such as, for example, dipping, rolling, spraying) the anointing, casting, etc. Curing preferably takes place at a temperature of 90 - 200oC.

The following examples illustrate the invention and its positive effect. In these examples have the following structures:

Composition N I

12 weight. parts of the vinyl polymer [CH2=CH(CH3)2SiO1/2]7[(CH3)3SiO1/2]3[(CH3)2SiO]250[CH3SiO3/2]8;

1.6 weight. part of the solution of the platinum complex in the above polymer with a concentration of platinum that is equal to 440 parts per million;

0.85 weight. part of the cross-linking agent composition [(CH3)3SiO1/2]2[(CH3)HSiO]30[(CH3)2SiO]9.

Composition N II

12 weight. parts of the vinyl polymer [CH2= CH(CH3)2SiO1/2]7[(CH3)3SiO1/2]3[CH3)2SiO]250[CHRazia platinum), equal 1320 parts per million;

0.85 weight. part of the cross-linking agent composition [(CH3)3SiO1/2]2(CH3)HSiO] 30[(CH3)2SiO]9.

The composition of the N III

12 weight. parts of the vinyl polymer [CH2= CH(CH3)2SiO1/2]7[(CH3)3SiO1/2]7[(CH3)2SiO]320[CH3SiO3/2]12;

1.6 weight. parts of a solution of the platinum complex in the above polymer with a concentration of platinum that is equal to 440 parts per million;

0.85 weight. part of the cross-linking agent composition [(CH3)3SiO1/2]2[(CH3)HSiO] 30[(CH3)2SiO]9.

The composition of the N IV

12 weight. parts of the vinyl polymer [CH2= CH(CH3)2SiO1/2]7[(CH3)3SiO1/2]7[(CH3)2SiO]320[CH3SiO3/2]12;

1.1 weight. part of the solution of the platinum complex in the above polymer with a concentration of platinum that is equal to 1320 parts per million;

0.85 weight. part of the cross-linking agent composition

[(CH3)3SiO1/2]2[(CH3)HSiO]30[(CH3)2SiO]9.

Composition A (comparison similar to example 2, prototype)

12 weight. parts of the 3
[(CH3)2SiO]250[CH3SiO3/2]4;

1.6 weight. part of the solution of the platinum complex in the above polymer with a concentration of platinum that is equal to 440 parts per million;

0,5 weight. part of the cross-linking agent composition [(CH3)3SiO1/2]2[(CH3)HSiO] 30[(CH3)2SiO]9< / BR>
Composition B (comparison similar to example 2, prototype)

12 weight. part of the vinyl polymer [CH2= CH(CH3)2SiO1/3] 3[(CH3)3SiO1/2]3[(CH3)2SiO]250[CH3SiO3/2]4;

1.1 weight. part of the solution of the platinum complex in the above polymer with a concentration of platinum that is equal to 1320 parts per million;

0,5 weight. part of the cross-linking agent composition [(CH3)3SiO1/2]2[(CH3) HSiO]30[(CH3)2SiO]9.

Example 1

Lab tests.

The proposed compositions of N I-IV and known compounds a and B is applied squeegee on satinirovannaya smooth paper of different origin. The film thickness is 2 μm. The paper remains in the contact furnace at a temperature of 90oC until the floor is no longer erased from the paper. The time of curing are shown in table CA is installed at 3 different temperatures, moreover, for the proposed compositions of N I and II and the known compounds a and B determine the velocity (Vmax) at the respective temperatures at which there is no erasing. Speeds in excess of 300 m/min at the time of testing machinetechnical reasons could not be performed.

The results are given in the table. The maximum working speed of installation, equal to 300 m/min, is carried out in each case and at the lowest temperature component 110oC, and the lowest content of the catalyst is equal to 50 parts per million. It is assumed that the application of the proposed composition possible a significantly higher operating speeds at a temperature of knitting 160oC.

1. Composition based organopolysiloxanes for application to thin-film substrate with a release coating containing having an unsaturated hydrocarbon group, branched organopolysiloxane, linear methylhydrosiloxane as a crosslinking agent and a platinum catalyst in an effective amount, wherein as having an unsaturated hydrocarbon group, branched organopolysiloxane contains a polymer with an average molecular weight of 9000 - 60000, kotoryj of links and the number of points of divergence in average 15 - 40, at least one diorganodichlorosilanes link and a maximum of half of all trigonometrically links free from unsaturated residues, other diorganodichlorosilanes links have one unsaturated residue, the content of unsaturated residue is 0.2 - 1 mmol/g, and as linear methylhydrosiloxane contains a polymer in which the number siloxanic links to mol higher than the ratio between the number diagenetically of links and the number of points of divergence, at least half difunctional siloxanic links is directly related to silicon atoms, with an unsaturated hydrocarbon group, branched organopolysiloxane and linear methylhydrosiloxane taken in an amount providing the ratio between the number krampfadern groups of linear methylhydrosiloxane and the number of unsaturated hydrocarbon groups, branched organopolysiloxane, equal to 1.5 to 3.5.

2. Composition under item 1, characterized in that the branching of organopolysiloxane consist of trifunctionally monoethanolamine links that half can be replaced tetrafunctional siloxane what each tetrafunctional siloxane link address both two places branch.

3. Composition under item 1 or 2, characterized in that it includes an extensive organopolysiloxane with unsaturated hydrocarbon groups, representing alkeneamine group with 2 to 8 carbon atoms.

4. The composition according to PP.1 to 3, characterized in that it includes organosiloxane links methylhydrosiloxane in the amount not exceeding double the ratio between the number diagenetically of links and the number of points of divergence of organopolysiloxane.

5. The composition according to PP.1 to 4, characterized in that it includes organopolysiloxane having at least 12 trifunctionally monoethanolamine chains on the molecule.

 

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12 cl, 1 dwg, 1 tbl, 4 ex

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