Elastomer compounds reinforced with silica and products containing same

Patent metadata

Field	Value
Publication number	US-11312824-B2
Application number	US-201615744313-A
Country	US
Kind code	B2
Filing date	Jul 13, 2016
Priority date	Jul 15, 2015
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

A silica elastomer composite having superior mechanical properties.

First claim

What is claimed is:

1. A vulcanizable elastomer composite comprising at least 40 phr of silica dispersed in natural rubber, wherein, when the vulcanizable elastomer composite is vulcanized, the resulting vulcanizate exhibits a ratio T300/T100 of at least −0.024s+b, wherein s is the amount of silica in the vulcanizable elastomer composite expressed as parts per hundred weight of rubber (phr) and b is 6.3 to 6.8, and has properties
a. a tan delta 60 of at most 0.0022s-c, wherein c is 0.06; and
b. a tensile strength in MPa of at least −0.21s+d, wherein d is 41 to 41.4; and
optionally
c. elongation at break (%) * tensile strength (MPa) of at least −211s+e, where e=27543.

2. The vulcanizable elastomer composite of claim 1 , wherein the vulcanizate exhibits a ratio T300/T100 of at least −0.024s+b, wherein b is 6.8.

3. The vulcanizable elastomer composite of claim 1 , wherein the vulcanizate exhibits a tensile strength in MPa of at least −0.21s+d, wherein d is 41.4.

4. The vulcanizable elastomer composite of claim 1 , wherein the vulcanizate exhibits a ratio T300/T100 of at most 7.

5. The vulcanizable elastomer composite of claim 1 , wherein the vulcanizable elastomer composite comprises up to about 180 phr of silica.

6. The vulcanizable elastomer composite of claim 1 , wherein the vulcanizable elastomer composite comprises up to 10% by weight of carbon black with respect to the total weight of reinforcing particles in the vulcanizable elastomer composite.

7. The vulcanizable elastomer composite of claim 1 , wherein the vulcanizate exhibits a tan delta 60 of at least 0.02.

8. The vulcanizable elastomer composite of claim 1 , wherein the vulcanizate exhibits a tensile strength of at most 40 MPa.

9. The vulcanizable elastomer composite of claim 1 , wherein said elongation at break (%) * tensile strength (MPa) is at most 21500.

10. The vulcanizable elastomer composite of claim 1 , wherein the silica is precipitated silica.

11. A vulcanized elastomer composite comprising a vulcanizate of the vulcanizable elastomer composite of claim 1 , optionally having a swell index of about 1.80 to about 2.20.

12. A vulcanizable elastomer composite comprising silica dispersed in natural rubber, wherein, when the vulcanizable elastomer composite is vulcanized, the resulting vulcanizate exhibits a ratio T300/T100 of at least 5.5 and a tan delta 60 of at most 0.05 and having a swell index of about 1.80 to about 2.20.

13. The vulcanizable elastomer composite of claim 12 , wherein the vulcanizable elastomer composite comprises at least 40 phr of silica.

Assignees

• Cabot Corp

Inventors

• Xiong Jincheng
• Green Martin C
• Williams William R
• Fomitchev Dmitry
• Adler Gerald D
• Mcdonald Duane G
• Grosz Ron

Classifications

• C08K3/36

  Silica · CPC title

• C08L2312/00

  Crosslinking · CPC title

• C08K3/04 Primary

  Carbon · CPC title

• C08J3/16

  by coagulating dispersions {(C08J3/122 takes precedence)} · CPC title

• C08J5/02

  Direct processing of dispersions, e.g. latex, to articles · CPC title