Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
1998-09-10
2001-06-12
Lipman, Bernard (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...
C525S332900, C525S333200, C525S387000
Reexamination Certificate
active
06245861
ABSTRACT:
FIELD OF THE INVENTION
This inventions relates to the crosslinking of high vinyl styrene-butadiene rubber. More particularly, this invention relates to the crosslinking of high vinyl styrene-butadiene rubber using organic peroxides and organic peroxide sulfur blends.
BACKGROUND OF THE INVENTION
Polymerization of unsaturated organic compounds by peroxides is well known in polymer synthesis. The small unsaturated organic molecules are the monomers which are polymerized to produce many various plastic products. Among those monomers are ethylene, propylene, styrene, &agr;-methyl styrene, vinyl toluene, vinyl ethers, and vinyl esters.
Peroxides have been used for many years to crosslink rubber compositions, however they have not found general use in the tire industry. Among the concerns that the tire industry has about the use of peroxides, some of these concerns relate to the radical mechanism of peroxide crosslinking and to the structure of the crosslink. Compositions cured with peroxides are thought to have shorter crosslinks which are less flexible than comparable crosslinks from sulfur-cured compositions and therefore peroxide-cured compositions are believed to exhibit less resistance to abrasion and cut growth. Also, peroxides are believed in the tire industry to be more sensitive to compounding ingredients and therefore, designing a peroxide compound would limit the flexibility available in a sulfur-cure system.
BRIEF DESCRIPTION OF THE INVENTION
The present invention relates to crosslinkable rubber compositions comprising an organic peroxide and a high vinyl styrene butadiene rubber. The crosslinkable rubber compositions may additionally comprise a sulfur curing ingredient, wherein the organic peroxide to sulfur curing ingredient is at a molar ratio of from about 3:1 to about 1:3.
The high vinyl styrene butadiene rubber comprises a vinyl mole percentage as measured using NMR of greater than about fifteen percent (15%), preferably greater than about twenty five (25%), more preferably of greater than about forty percent (40%).
The present invention also relates to the process for curing the crosslinkable rubber compositions and to the crosslinked rubber compositions wherein the crosslinked rubber compositions comprise an organic peroxide and a high vinyl styrene butadiene rubber.
The crosslinked rubber compositions of the present invention are useful in making final articles such as hoses, belts, parts and particularly tires.
REFERENCES:
patent: 5446191 (1995-08-01), Suyama
patent: 5932660 (1999-08-01), Meijer
Hercules Incorporated
Lipman Bernard
O'Flynn O'Brier Robert P.
Samuels Gary A.
LandOfFree
Use of peroxides to crosslink rubber compositions containing... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Use of peroxides to crosslink rubber compositions containing..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Use of peroxides to crosslink rubber compositions containing... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2467609