Organopolysiloxane cluster polymer for rapid air UV cure

Patent metadata

Field	Value
Publication number	US-12577352-B2
Application number	US-202117927400-A
Country	US
Kind code	B2
Filing date	Aug 30, 2021
Priority date	Sep 1, 2020
Publication date	Mar 17, 2026
Grant date	Mar 17, 2026

Abstract

A composition contains a cluster organopolysiloxane having the following structure:

where:

and R is independently in each occurrence selected from a group consisting of aryl groups and alkyl groups having from 2 to 6 carbons; R′ and R″ are independently in each occurrence selected from divalent hydrocarbon groups containing from 2 to 6 carbon atoms; n is a value in a range of 50 to less than 200; and A is independently in each occurrence selected from a group consisting of acrylate, methacrylate and trialkoxysilyl groups; provided that, on average, 50 to 95 mole-percent of the A groups are selected from acrylate and methacrylate groups and 5 to 50 mole-percent of the A groups are selected from trialkoxysilyl groups.

First claim

What is claimed is:

1 . A composition comprising a cluster organopolysiloxane having the following structure:

where:

(b) R is independently in each occurrence selected from a group consisting of aryl groups and alkyl groups having from 2 to 6 carbons;
(c) R′ and R″ are independently in each occurrence selected from divalent hydrocarbon groups containing from 2 to 6 carbon atoms;
(d) the average n value for a sample is a value in a range of 50 to less than 200; and
(e) A is independently in each occurrence selected from a group consisting of acrylate, methacrylate and trialkoxysilyl groups; provided that, on average, 50 to 95 mole-percent of the A groups are selected from acrylate and methacrylate groups and 5 to 50 mole-percent of the A groups are selected from trialkoxysilyl groups.

2 . The composition of claim 1 , where each R is a methyl.

3 . The composition of claim 1 , where each R′ is —(CH 2 ) 2 — and each R″ is —(CH 2 ) 3 — when connected to an A group that is acrylate or methacrylate and —(CH 2 ) 2 — when connected to an A group that is trialkoxysilyl.

4 . The composition of claim 1 , where the alkoxy groups of the trialkoxysilyl groups are independently in each occurrence selected from methoxy, ethoxy and propoxy.

5 . The composition of claim 1 , where each R is methyl, each R′ is —(CH 2 ) 2 — and each R″ is —(CH 2 ) 3 — when connected to an A group that is acrylate or methacrylate and —(CH 2 ) 2 — when connected to an A group that is trialkoxysilyl, and each alkoxy group of the trialkoxysilyl groups is methoxy.

6 . The composition of claim 1 , where the composition further comprises oligomers and/or by-products where the oligomers have the following structure:
Si(—OSiR 2 —R′—SiR 2 OSi(R 2 )—R″-A) 4
and the by-products have the following structure:

where 95 mole-percent or more and at the same time less than 100 mol-percent of the X groups have the following structure:

and where greater than zero mol-percent and at the same time 5 mole-percent or less of the X groups have the following X′ structure:
X′=—OSiR 2 —R′ a

where R, R′, R″, A, X, n are as previously defined, R′ a corresponds to a monovalent terminally unsaturated precursor to R′ formed by removing a hydrogen from a carbon adjacent to a terminal carbon of R′ and forming a double bond between that carbon and the terminal carbon.

7 . The composition of claim 1 , wherein the composition is a curable composition that further comprises an ultraviolet light activated free radical initiator.

8 . The composition of claim 7 , wherein the composition further comprises a moisture cure catalyst.

9 . A method of using the composition of claim 7 comprising applying the composition to a substrate and then exposing the composition to ultraviolet light to form an article comprising the cured composition.

10 . An article comprising the composition of claim 1 on a surface of a substrate.

11 . The article of claim 10 where the composition is in a cured state.

Assignees

• Dow Global Technologies Llc
• Dow Silicones Corp

Inventors

• Walker James A
• Liu Junying
• Hanley Patrick S
• Thomas Ryan

Classifications

• C09D183/06

  containing silicon bound to oxygen-containing groups (C09D183/12 takes precedence) · CPC title

• C08G77/18 Primary

  to alkoxy or aryloxy groups · CPC title

• C08G77/12

  containing silicon bound to hydrogen · CPC title

• C08G77/08

  characterised by the catalysts used · CPC title

• C08G2170/00

  Compositions for adhesives · CPC title