Elastomer with C—O—Si linkages between polyester backbone and crosslinker

Patent metadata

Field	Value
Publication number	US-12441846-B2
Application number	US-202319102442-A
Country	US
Kind code	B2
Filing date	Sep 5, 2023
Priority date	Sep 9, 2022
Publication date	Oct 14, 2025
Grant date	Oct 14, 2025

Abstract

A composition containing an elastomer, the elastomer characterized by having a polyester backbone crosslinked with a crosslinker and having a carbon-oxygen-silicon linkage between ester groups and crosslinkers.

First claim

What is claimed is:

1. A composition comprising an elastomer, the elastomer characterized by having a polyester backbone crosslinked with a crosslinker and having a carbon-oxygen-silicon linkage between ester groups and crosslinkers, where the crosslinker is a polysiloxane.

2. The composition of claim 1 , wherein the polyester backbone is free of silicon-oxygen-silicon linkages.

3. The composition of claim 1 , where there is at least one carbon-oxygen-silicon linkage between any polyester and any siloxane linkage in the elastomer.

4. The composition of claim 1 , wherein each polyester backbone has at least three bonds to crosslinkers and/or each crosslinker has at least three bonds to backbone polymers.

5. The composition of claim 1 , wherein the elastomer is solvent swollen with a non-aqueous solvent.

6. The composition of claim 5 , wherein the elastomer is present in particulate form and the composition is in the form of a paste.

7. A method for preparing the composition of claim 1 , the method comprising preparing the elastomer by:
a. providing a backbone polymer having at least two terminal unsaturated carbon-carbon bonds that are separated from any polyester group by a carbon-oxygen-silicon bond and a polysiloxane crosslinker material that contains multiple silylhydride groups provided that at least one of the backbone polymer or crosslinker has an average unsaturated carbon-carbon bond functionality of more than two and/or the crosslinker has an average silylhydride functionality of greater than two; and
b. crosslinking the backbone polymer with the crosslinker material by hydrosilylation addition between unsaturated carbon-carbon bonds of the backbone polymer and silylhydride groups of the crosslinker material to form an elastomer.

8. The method of claim 7 , wherein the hydrosilylation reaction is run in a non-aqueous solvent and produces a solvent-swollen elastomer, provided that if the non-aqueous solvent is a polysiloxane and the oganosilyl-functional polyester contains more than two terminal carbon-carbon double bonds then the crosslinker has a weight-average molecular weight of less than 7400.

9. The process of claim 8 , further comprising:
a. optionally adding additional non-aqueous solvent to the solvent-swollen elastomer; and
b. subjecting the solvent-swollen elastomer to shear in order to break the solvent-swollen elastomer into particle form to produce a paste.

Assignees

• Dow Silicones Corp

Inventors

• Baumgartner Ryan
• Mangold Shane
• Wenzlick Zachary

Classifications

• C08G63/6956

  Dicarboxylic acids and dihydroxy compounds · CPC title

• C08G63/6952

  derived from hydroxycarboxylic acids · CPC title

• A61Q19/00

  Preparations for care of the skin · CPC title

• A61K2800/10

  General cosmetic use · CPC title

• A61K8/85

  Polyesters · CPC title