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US4048427A Expired / Lapsed US ⏱️ 0.0 years remaining

Preparation of solution polymers

Assignee: Aerojet Rocketdyne Holdings Inc
•
Filing: 1976-04-26
•
Granted: 1977-09-13
•
Expires: 1996-04-26
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Abstract

Abstract This invention relates to the preparation of solution polymers and rubbers from vinyl monomers using a new catalyst complex of a barium di-tert-alkoxide-hydroxide salt and an organic lithium compound. In particular, homopolymers and copolymers of butadiene with styrene and/or isoprene, prepared with this catalyst, are uniquely characterized by the butadiene units having a low vinyl content (not over about 12%) and a trans-1,4 structure of from about 70 to 81%. Also, the copolymer has a random comonomer sequence distribution. This molecular structure permits elastomers containing little or no styrene to have sufficient stereoregularity to crystallize. Furthermore, the butadiene homopolymer and copolymer with styrene and/or isoprene exhibit a broad molecular weight distribution as well as tack and green-strength which are valuable properties for a rubber to possess when building tires.

Inventors

  • 👤 Ivan Glen Hargis
  • 👤 Russell Anthony Livigni
  • 👤 Sundar Lal Aggarwal

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-31 02:04
CPC Classifications
C; C08; C08F; C08F12/00; C08F12/02; C08F12/04; C08F12/06; C08F36/00; C08F36/02; C08F36/04

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 156 words
A rubbery polymer selected from the group consisting of homopolybutadiene-1,3 and a random copolymer of butadiene-1,3 and up to about 15% by weight total of said copolymer of copolymerized styrene and/or isoprene, said polymer exhibiting: a. a glass transition temperature of from about -80° to -100° C. as determined by differential thermal analysis, b. a crystalline melting point (peak values) in the unstretched state from about -10° to +43° C. as determined by differential thermal analysis, c. a trans-1,4 content of from about 70 to 81% and a vinyl content of up to about 12% for the butadiene units, d. a heterogeneity index of from about 4 to 40, e. a number average molecular weight of from about 20,000 to 300,000, f. crystallinity when stretched in the uncompounded and uncured state as shown by x-ray diffraction data, g. green strength and building tack, and h. a broad molecular weight distribution as determined by gel permeation chromotography.
Claim 2
Dependent Claim 156 words
A rubbery polymer selected from the group consisting of homopolybutadiene-1,3 and a random copolymer of butadiene-1,3 and up to about 15% by weight total of said copolymer of copolymerized styrene and/or isoprene, said polymer exhibiting: a. a glass transition temperature of from about -80° to -100° C. as determined by differential thermal analysis, b. a crystalline melting point (peak values) in the unstretched state from about -10° to +43° C. as determined by differential thermal analysis, c. a trans-1,4 content of from about 70 to 81% and a vinyl content of up to about 12% for the butadiene units, d. a heterogeneity index of from about 4 to 40, e. a number average molecular weight of from about 20,000 to 300,000, f. crystallinity when stretched in the uncompounded and uncured state as shown by x-ray diffraction data, g. green strength and building tack, and h. a broad molecular weight distribution as determined by gel permeation chromotography.
Claim 3
Dependent Claim 15 words
A rubbery copolymer according to claim 1 where the second named copolymerized monomer is styrene.
Claim 4
Dependent Claim 15 words
A rubbery copolymer according to claim 1 where the second named copolymerized monomer is isoprene.
Claim 5
Dependent Claim 20 words
A rubbery copolymer according to claim 1 where the second named copolymerized monomer is a mixture of isoprene and styrene.

References Cited (Backward Citations)

US3657209A Cited
US3629213A Cited
US3687916A Cited
US3846385A Cited
US3865749A Cited
US3896102A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1980-09-12 1981-03-14 1981-09-13 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1984-09-12 1985-03-14 1985-09-13 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1988-09-12 1989-03-14 1989-09-13 $7700.00 Window Closed / Lapsed

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