Siloxy containing salt compounds

Details Siloxy containing salt compounds Siloxy containing salt compounds

2001-02-27

2003-07-15

Wu, David W. (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S332700, C525S331900, C524S495000, C524S492000

Reexamination Certificate

active

06593433

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a compound which is useful in rubber compositions containing fillers and the processing of a rubber composition containing such fillers.
BACKGROUND OF THE INVENTION
U.S. Pat. Nos. 3,842,111, 3,873,489 and 3,978,103 disclose various sulfur containing organosilane compounds. Sulfur containing organosilane compounds are useful coupling agents between rubber and silica fillers providing for improved physical properties. Unfortunately during mixing with rubber, processing problems ensue.
SUMMARY OF THE INVENTION
The present invention relates to siloxy containing salt compounds of the formula:
wherein each R
1
and R
2
are independently selected from the group consisting of alkoxy radicals having from 1 to 8 carbon atoms and alkyls having from 1 to 8 carbon atoms; R
3
is selected from the group consisting of alkoxy radicals having from 1 to 8 carbon atoms; each R
4
is independently selected from the group consisting of alkylenes and having from 1 to 15 carbon atoms, arylenes alkyl substituted arylenes having from 6 to 10 carbon atoms, —R
5
—O—R
6
— and —R
5
—NH—R
7
—; R
5
and R
7
are independently selected from the group consisting of alkylenes having from 1 to 15 carbon atoms, arylenes and alkyl substituted arylenes having from 6 to 10 carbon atoms; R
6
is selected from the group consisting of alkylenes having from 1 to 15 carbon atoms, arylenes and alkyl substituted arylenes having from 6 to 10 carbon atoms and alkenylenes having from 2 to 15 carbon atoms; and x is an integer of from 0 to 7.
DETAILED DESCRIPTION OF THE INVENTION
There is also disclosed a method for processing a rubber composition which comprises mixing
(i) 100 parts by weight of at least one sulfur vulcanizable elastomer containing olefinic unsaturation;
(ii) 10 to 250 phr of a filler; and
(iii) 0.05 to 10 phr of a compound of the formula:
wherein each R
1
and R
2
are independently selected from the group consisting of alkoxy radicals having from 1 to 8 carbon atoms and alkyls having from 1 to 8 carbon atoms; R
3
is selected from the group consisting of alkoxy radicals having from 1 to 8 carbon atoms; each R
4
is independently selected from the group consisting of alkylenes and having from 1 to 15 carbon atoms, arylenes alkyl substituted arylenes having from 6 to 10 carbon atoms, —R
5
—O—R
6
— and —R
5
—NH—R
7
—; R
5
and R
7
are independently selected from the group consisting of alkylenes having from 1 to 15 carbon atoms, arylenes and alkyl substituted arylenes having from 6 to 10 carbon atoms; R
6
is selected from the group consisting of alkylenes having from 1 to 15 carbon atoms, arylenes and alkyl substituted arylenes having from 6 to 10 carbon atoms and alkenylenes having from 2 to 15 carbon atoms; and x is an integer of from 0 to 7.
There is also disclosed a rubber composition comprising an elastomer containing olefinic unsaturation and a compound of the formula:
wherein each R
1
and R
2
are independently selected from the group consisting of alkoxy radicals having from 1 to 8 carbon atoms and alkyls having from 1 to 8 carbon atoms; R
3
is selected from the group consisting of alkoxy radicals having from 1 to 8 carbon atoms; each R
4
is independently selected from the group consisting of alkylenes and having from 1 to 15 carbon atoms, arylenes alkyl substituted arylenes having from 6 to 10 carbon atoms, —R
5
—O—R
6
— and —R
5
—NH—R
7
—; R
5
and R
7
are independently selected from the group consisting of alkylenes having from 1 to 15 carbon atoms, arylenes and alkyl substituted arylenes having from 6 to 10 carbon atoms; R
6
is selected from the group consisting of alkylenes having from 1 to 15 carbon atoms, arylenes and alkyl substituted arylenes having from 6 to 10 carbon atoms and alkenylenes having from 2 to 15 carbon atoms; and x is an integer of from 0 to 7.
The present invention may be used to process rubbers or elastomers containing olefinic unsaturation. The phrase “rubber or elastomer containing olefinic unsaturation” is intended to include both natural rubber and its various raw and reclaim forms as well as various synthetic rubbers. In the description of this invention, the terms “rubber” and “elastomer” may be used interchangeably, unless otherwise prescribed. The terms “rubber composition”, “compounded rubber” and “rubber compound” are used interchangeably to refer to rubber which has been blended or mixed with various ingredients and materials and such terms are well known to those having skill in the rubber mixing or rubber compounding art. Representative synthetic polymers are the homopolymerization products of butadiene and its homologues and derivatives, for example, methylbutadiene, dimethylbutadiene and pentadiene as well as copolymers such as those formed from butadiene or its homologues or derivatives with other unsaturated monomers. Among the latter are acetylenes, for example, vinyl acetylene; olefins, for example, isobutylene, which copolymerizes with isoprene to form butyl rubber; vinyl compounds, for example, acrylic acid, acrylonitrile (which polymerize with butadiene to form NBR), methacrylic acid and styrene, the latter compound polymerizing with butadiene to form SBR, as well as vinyl esters and various unsaturated aldehydes, ketones and ethers, e.g., acrolein, methyl isopropenyl ketone and vinylethyl ether. Specific examples of synthetic rubbers include neoprene (polychloroprene), polybutadiene (including cis-1,4-polybutadiene), polyisoprene (including cis-1,4-polyisoprene), butyl rubber, styrene/isoprene/butadiene rubber, copolymers of 1,3-butadiene or isoprene with monomers such as styrene, acrylonitrile and methyl methacrylate, as well as ethylene/propylene terpolymers, also known as ethylene/propylene/diene monomer (EPDM), and in particular, ethylene/propylene/dicyclopentadiene terpolymers. Additional examples of rubbers which may be used include silicon-coupled and tin-coupled star-branched polymers. The preferred rubber or elastomers are polybutadiene and SBR.
In one aspect the rubber is preferably of at least two of diene based rubbers. For example, a combination of two or more rubbers is preferred such as cis 1,4-polyisoprene rubber (natural or synthetic, although natural is preferred), 3,4-polyisoprene rubber, styrene/isoprene/butadiene rubber, emulsion and solution polymerization derived styrene/butadiene rubbers, cis 1,4-polybutadiene rubbers and emulsion polymerization prepared butadiene/acrylonitrile copolymers.
In one aspect of this invention, an emulsion polymerization derived styrene/butadiene (E-SBR) might be used having a relatively conventional styrene content of about 20 to about 28 percent bound styrene or, for some applications, an E-SBR having a medium to relatively high bound styrene content, namely, a bound styrene content of about 30 to about 45 percent.
The relatively high styrene content of about 30 to about 45 for the E-SBR can be considered beneficial for a purpose of enhancing traction, or skid resistance, of the tire tread. The presence of the E-SBR itself is considered beneficial for a purpose of enhancing processability of the uncured elastomer composition mixture, especially in comparison to a utilization of a solution polymerization prepared SBR (S-SBR).
By emulsion polymerization prepared E-SBR, it is meant that styrene and 1,3-butadiene are copolymerized as an aqueous emulsion. Such are well known to those skilled in such art. The bound styrene content can vary, for example, from about 5 to about 50 percent. In one aspect, the E-SBR may also contain acrylonitrile to form a terpolymer rubber, as E-SBAR, in amounts, for example, of about 2 to about 30 weight percent bound acrylonitrile in the terpolymer.
Emulsion polymerization prepared styrene/butadiene/acrylonitrile copolymer rubbers containing about 2 to about 40 weight percent bound acrylonitrile in the copolymer are also contemplated as diene based rubbers for use in this invention.
The solution polymerization prepared SBR (S-SBR) typically has a bound styrene content in a range of about 5 to about 50, prefer

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