Polydiphenylsiloxane coating formulation and method for forming a coating

Patent metadata

Field	Value
Publication number	US-2015267078-A1
Application number	US-201414219653-A
Country	US
Kind code	A1
Filing date	Mar 19, 2014
Priority date	Mar 19, 2014
Publication date	Sep 24, 2015
Grant date	—

Abstract

Provided is composition for a liquid coating. The composition may include a silanol terminated copolymer, at least one cross-linker, and a catalyst. The silanol terminated copolymer may include from about 10 to about 25 mol % of a diphenylsiloxane repeat unit and greater than about 50 mol % of a dialkylsiloxane repeat unit. The at least one cross-linker may be one or more selected from: tetraethoxysilane (TEOS), a trialkoxysilane terminated polydialkylsiloxane and/or one or more of a trialkoxysilyl terminated polymer.

First claim

What is claimed is:

1 . A composition for a liquid coating, comprising:
a silanol terminated copolymer comprising from about 10 to about 25 mol % of a diphenylsiloxane repeat unit and greater than about 50 mol % of a dialkylsiloxane repeat unit; at least one cross-linker selected from the group consisting of tetraethoxysilane (TEOS), a trialkoxysilane terminated polydialkylsiloxane and one or more trialkoxysilyl terminated polymer; and a catalyst.

2 . The composition of claim 1 , further comprising at least one solvent.

3 . The composition of claim 1 , wherein the silanol terminated siloxane copolymer is represented by:

where R is a linear, branched, or cyclic saturated or unsaturated alkyl group containing from about 1 to 30 carbon atoms and s is from about 1 to about 500 and t is from about 1 to about 300.

4 . The composition of claim 1 , wherein the copolymer comprises a molecular weight of between about 500 g/mol and about 50,000 g/mol.

5 . The composition of claim 1 , wherein the trialkoxysilane terminated polydialkylsiloxane is represented by

wherein R is a linear, branched, or cyclic saturated or unsaturated alkyl group containing from about 1 to 30 carbon atoms, R′ is a hydrogen atom or a linear, branched, or cyclic saturated or unsaturated alkyl group containing from about 1 to 30 carbon atoms, n is from about 0 to about 50 and q is from about 1 to about 500.

6 . The composition of claim 1 , wherein the one or more trialkoxysilyl terminated polymer is represented by formulae I or II:

where,
L 1 , L 2 and L 3 are linker groups, such as, for example C 1 to C 6 alkyl bridge groups; X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , X 8 and X 9 are independently selected from the group consisting of a hydroxyl, a reactive alkoxide functionality and an unreactive aliphatic functionality; and
R 1 and R 2 are independently selected from the group consisting of: a) a linear, branched or cyclic, saturated or unsaturated alkyl group, b) a perfluorinated linear, branched or cyclic carbon chain, c) a group having one or more dialkylsiloxane units, d) a substituted or unsubstituted polyether group optionally comprising one or more amide moieties, carbonyl moieties, carboxylic acid ester moieties or amine moieties, and e) a polyamine group optionally comprising a saturated hydrocarbon chain moiety.

7 . The composition of claim 6 , wherein the one or more trialkoxysilyl terminated polymer comprises at least one of a first trialkoxysilyl terminated polymer, a second trialkoxysilyl terminated polymer and a third trialkoxysilyl terminated polymer, wherein the first second and third trialkoxysilyl terminated polymers have different structures.

8 . The composition of claim 7 , wherein the one or more trialkoxysilyl terminated polymer further comprises at least one of a fourth trialkoxysilyl terminated polymer, a fifth trialkoxysilyl terminated polymer and a sixth trialkoxysilyl terminated polymer, wherein the first, second, third, fourth, fifth and sixth trialkoxysilyl terminated polymers have different structures.

9 . The composition of claim 6 , wherein the at least one crosslinker comprises TEOS and at least one of a first trialkoxysilyl terminated polymer, a second trialkoxysilyl terminated polymer, a third trialkoxysilyl terminated polymer, a fourth trialkoxysilyl terminated polymer, a fifth trialkoxysilyl terminated polymer, and a sixth trialkoxysilyl terminated polymer, wherein each of the first, second, third, fourth, fifth and sixth trialkoxysilyl terminated polymers have different structures.

10 . The composition of claim 1 , wherein the catalyst comprises about 0.1 wt % to about 5 wt % of the composition and selected from at least one in the group consisting of titanate, zirconate and tin.

11 . A coating method, comprising:
forming a liquid coating composition on a substrate; and forming a cured coating by curing the liquid coating composition at a temperature in the range of 80° C. to about 150° C., wherein the liquid coating composition comprises:
a silanol terminated copolymer comprising from about 10 to about 25 mol % of a diphenylsiloxane repeat unit and greater than about 50 mol % of a dialkylsiloxane repeat unit;
at least one cross-linker; and
a catalyst comprising about 0.1 wt % to about 5 wt % of the liquid coating composition and selected from at least one in the group consisting of titanate, zirconate and tin;
wherein the silanol terminated siloxane copolymer is represented by:

where R is a linear, branched, or cyclic saturated or unsaturated alkyl group containing from about 1 to 30 carbon atoms and s is from about 1 to about 500 and t is from about 1 to about 300, and
wherein the at least one crosslinker comprises at least one selected from the group consisting of tetraethoxysilane (TEOS), a trialkoxysilane terminated polydialkylsiloxane and one or more trialkoxysilyl terminated polymer.

12 . The method of claim 11 , further comprising, polishing the cured coating to expose portions that are more hydrophilic than an upper surface of the cured coating.

13 . The method of claim 11 , wherein the trialkoxysilane terminated polydialkylsiloxane is represented by

wherein R is a linear, branched, or cyclic saturated or unsaturated alkyl group containing from about 1 to 30 carbon atoms, R′ is a hydrogen atom or a linear, branched, or cyclic saturated or unsaturated alkyl group containing from about 1 to 30 carbon atoms, n is from about 0 to about 50 and q is from about 1 to about 500.

14 . The method of claim 11 , wherein the one or more trialkoxysilyl terminated polymer is represented by formulae I or II:

where,
L 1 , L 2 and L 3 are linker groups, such as, for example C 1 to C 6 alkyl bridge groups; X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , X 8 and X 9 are independently selected from the group consisting of a hydroxyl, a reactive alkoxide functionality and an unreactive aliphatic functionality; and
R 1 and R 2 are independently selected from the group consisting of: a) a linear, branched or cyclic, saturated or unsaturated alkyl group, b) a perfluorinated linear, branched or cyclic carbon chain, c) a group having one or more dialkylsiloxane units, d) a substituted or unsubstituted polyether group optionally comprising one or more amide moieties, carbonyl moieties, carboxylic acid ester moieties or amine moieties, and e) a polyamine group optionally comprising a saturated hydrocarbon chain moiety.

15 . The method of claim 14 , wherein the one or more trialkoxysilyl terminated polymer comprises at least one of a first trialkoxysilyl terminated polymer, a second trialkoxysilyl terminated polymer and a third trialkoxysilyl terminated polymer, wherein each of the first second and third trialkoxysilyl terminated polymers have different structures.

16 . The method of claim 15 , wherein the one or more trialkoxysilyl terminated polymer further comprises

Assignees

• Xerox Corp

Inventors

• Dooley Brynn

Classifications

• B41J2/0057

  where an intermediate transfer member receives the ink before transferring it on the printing material · CPC title

• Y10T428/31663

  As siloxane, silicone or silane · CPC title

• C09D183/04 Primary

  Polysiloxanes · CPC title