IP Library › Granted Patent US 12,503,544
Granted Patent B2
US 12,503,544 · App. 17/429,505 · Granted Dec 23, 2025

Elastomeric compositions and methods of use

Inventors: Cynthia Kutchko (Pittsburgh, PA); Brian Chiang (Pittsburgh, PA); Bryan W. Wilkinson (Pittsburgh, PA); Eric S. Epstein (Pittsburgh, PA); Michael A. Bubas (Pittsburgh, PA)
Assignee: PPG Industries Ohio, Inc.
C08G18/12B29C64/106C08G18/10C08G18/244C08G18/246C08G18/3228C08G18/3234C08G18/4804C08G18/4837C08G18/4854C08G18/5024C08G18/5036C08G18/61C08G18/69C08G18/755C08G77/16C08K3/36C08K5/0041C08L75/02B33Y70/00B33Y80/00
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Quick Facts
Patent No.
US 12,503,544
App. No.
17/429,505
Granted
Dec 23, 2025
Kind
B2
Abstract

Compositions comprising a combination of low molecular weight prepolymers and high molecular weight prepolymers are disclosed. The compositions are used to fabricate elastomeric articles having high tensile strength and high tensile elongation.

Claims (43)

1 . A coreactive composition comprising:

(a) from 10 wt % to 80 wt % of a first elastomeric prepolymer, wherein the first elastomeric prepolymer comprises:

an isocyanate-functional polyether prepolymer; and

a number average molecular weight from 500 Da to 6,000 Da;

(b) from 10 wt % to 80 wt % of a second elastomeric prepolymer, wherein the second elastomeric prepolymer comprises:

an amine-functional polyether prepolymer; and

a number average molecular weight from 500 Da to 6,000 Da; and

(c) from 5 wt % to 25 wt % of a third elastomeric prepolymer, wherein the third elastomeric prepolymer comprises:

a silanol-functional polydimethylsiloxane prepolymer; and

a number average molecular weight from 50,000 Da to 500,000 Da, wherein,

the number average molecular weight is determined by gel permeation chromatography; and wt % is based on the total weight of the first elastomeric prepolymer, the second elastomeric prepolymer, and the third elastomeric prepolymer in the coreactive composition.

2 . The coreactive composition of claim 1 , wherein the coreactive composition comprises:

from 80 mol % to 98 mol % of the combination of the first elastomeric prepolymer and the second elastomeric prepolymer; and

from 2 mol % to 20 mol % of the third elastomeric prepolymer, wherein,

mol % is based on the total moles of the first elastomeric prepolymer, the second elastomeric prepolymer, and the third elastomeric prepolymer in the coreactive composition.

3 . The coreactive composition of claim 1 , wherein the third elastomeric prepolymer is not reactive with the second elastomeric prepolymer.

4 . The coreactive composition of claim 1 , wherein the third elastomeric prepolymer is reactive with the first elastomeric prepolymer and/or the second elastomeric prepolymer.

5 . The coreactive composition of claim 4 , wherein a reaction rate of a reaction between the third elastomeric prepolymer and the first elastomeric prepolymer and/or the second elastomeric prepolymer is slower than a reaction rate of a reaction between the first elastomeric prepolymer and the second elastomeric prepolymer.

6 . The coreactive composition of claim 1 , wherein the third elastomeric prepolymer comprises a backbone having the structure of Formula (10):

—Si(—CH 3 ) 2 —O—(—Si(CH 3 ) 2 —O—) n2 —Si(CH 3 ) 2 —  (10)

where n2 is an integer from 1,500 to 2,500.

7 . The coreactive composition of claim 1 , wherein,

the third elastomeric prepolymer comprises a number average molecular weight from 100,000 Da to 400,000 Da; and

the number average molecular weight is determined by gel permeation chromatography.

8 . The coreactive composition of claim 1 , wherein each of the first elastomeric prepolymer and the second elastomeric prepolymer independently comprises a number average molecular weight from 1,000 Da to 3,500 Da.

9 . The coreactive composition of claim 1 , further comprising a monomeric polyamine having a molecular weight from 150 Da to 500 Da and/or a secondary diamine.

10 . The coreactive composition of claim 1 , further comprising a low-density filler, wherein the low-density filler comprises a specific gravity less than 1.

11 . A cured polymer prepared from the coreactive composition of claim 1 .

12 . An article comprising the cured polymer of claim 11 .

13 . The article of claim 12 , wherein,

the article has a maximum tensile strain from 100% to 2,000%, wherein the maximum tensile strain is determined according to ASTM D412.4893;

a Young's modulus from 4 MPa to 60 MPa, wherein the Young's modulus is determined according to ASTM D412.4893;

a hardness greater than Shore 10A, wherein the Shore A hardness is determined according to ASTM D2240; and/or

the maximum tensile strain is from 400% to 800% when pulled at a 500 mm/min strain rate.

14 . A method of fabricating an article comprising:

(a) depositing the coreactive composition of claim 1 , in a shape of the article; and

(b) curing the deposited coreactive composition to form the article.

15 . The method of claim 14 , wherein depositing comprises three-dimensional printing.

16 . The method of claim 14 , further comprising, before step (a), combining a first component and a second component to provide the coreactive composition; wherein,

the first component comprises the first elastomeric prepolymer;

the second component comprises the second elastomeric prepolymer; and

the first component and/or the second component comprises the third elastomeric prepolymer.

17 . An article fabricated using the method of claim 14 .

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 9, 2021
From: KUTCHKO, CYNTHIA; CHIANG, BRIAN; WILKINSON, BRYAN W.; EPSTEIN, ERIC S.; BUBAS, MICHAEL A.
To: PPG INDUSTRIES OHIO, INC.
Reel/Frame 057122/0677 →
Continuity (2)
Provisional Application 62803664 · Feb 11, 2019
Related Publication 20220098355A1 · Mar 31, 2022
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