Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1987-12-11
1991-12-10
Teskin, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 86, 525 98, 525 99, 525191, 525192, 525193, 525313, 525314, 525315, 525319, 5253323, 5253334, 525918, 526339, 5263487, 152525, C08L 906, C08L 4700, C08L 5104, C08L 2322
Patent
active
050719130
ABSTRACT:
A substantially gel free C.sub.4 to C.sub.7 isoolefin homopolymer rubber, butyl copolymer rubber, halogenated butyl rubber (e.g., chlorinated or brominated), or mixtures thereof, comprising a molecular weight distribution such that the ratio of the moments of said molecular weight distribution, Mz/Mw, is equal to or exceeds 2.0, and that portion of said molecular weight distribution which is equal to and greater than 4 times the peak molecular weight, Mp, comprises greater than 8 percent of the total polymer species, and Mp is greater than about 250,000 and wherein said polymer species of molecular weight less than Mp are substantially branch free. Various means are disclosed for effecting the molecular weight distribution including blending of homopolymers and/or copolymers of appropriate molecular weight and molecular weight distribution and direct polymerization using a functional reagent to introduce branching. The rubber compositions are particularly useful in applications in which butyl or halogenated butyl rubber is used and where it is desired to obtain high green strength in combination with an increased rate of stress relaxation. Such polymers are particularly well suited for use in tire innerliner compositions.
REFERENCES:
patent: 1443149 (1923-01-01), Schidrowitz
patent: 1682857 (1928-09-01), Schidrowitz
patent: 3265765 (1966-08-01), Holden et al.
patent: 3476831 (1969-11-01), Daumiller et al.
patent: 3904708 (1975-09-01), Kennedy et al.
patent: 3933942 (1976-01-01), Kennedy et al.
patent: 4252710 (1981-02-01), Powers et al.
patent: 4342670 (1982-08-01), Ahagon et al.
patent: 4358560 (1982-11-01), Powers et al.
patent: 4474924 (1984-10-01), Powers et al.
patent: 4624296 (1986-11-01), Takiguchi
W. G. Wren, The Chemistry of Natural Rubber Production, Chemistry of Natural Rubber, pp. 378-412, 1960.
L. M. White et al., Industrial and Engineering Chemistry, Aug. 1948, "Gel as a Definitive Property in GR-S Technology", vol. 37, No. 8, pp. 770-775.
R. A. Crawford, G. J. Tiger, Industrial and Engineering Chemistry, vol. 41, No. 3, "Improved-Processing GR-S by Variations in Compounding", Mar. 1949, pp. 592-596.
D. L. Schoene et al., Industrial and Engineering Chemistry, "Development of a Better Processing GR-S", Dec. 1946, vol. 38, No. 12, pp. 1246-1249.
Fusco James V.
Handy Debra C.
Powers Kenneth W.
Wang Hsien-Chang
Cohen H. L.
Exxon Chemical Patents Inc.
Teskin Fred
LandOfFree
Rubbery isoolefin polymers exhibiting improved processability does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Rubbery isoolefin polymers exhibiting improved processability, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rubbery isoolefin polymers exhibiting improved processability will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1041277