US4426495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of star polymers
Assignee: Aerojet Rocketdyne Holdings Inc
•
Filing: 1982-09-22
•
Granted: 1984-01-17
•
Expires: 2002-09-22
Abstract
Abstract Divinyl benzene and/or diisopropenyl benzene in hydrocarbon solvent is added over a period of time at low temperature to a hydrocarbon solvent containing a C 2-20 normal, secondary or tertiary alkyl or cycloalkyl lithium compound and a tertiary alkylamine having 2-4 carbon atoms prepared at low temperature to provide an initiator having an average of from 4 to 9 C-Li sites and a VPO Mn of from about 750 to 4,000. These initiators a re useful in polymerizing dienes and vinyl monomers to provide star polymers having an average of from about 4 to 9 arms or branches. These star polymers among other things are useful low profile or low shrink additives for FRPs, e.g., glass fiber reinforced plastics.
Inventors
- 👤 Francis J. Vitus
- 👤 Ivan G. Hargis
- 👤 Russell A. Livigni
- 👤 Sundar L. Aggarwal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:05
CPC Classifications
C; C08; C08F; C08F236/00; C08F236/02; C08F236/04; C08F236/10; C08F297/00; C08F297/02; C08F297/04; C08F297/042; C08L; C08L21/00; C08L67/00; C08L67/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
175 words
A thermosetting composition selected from the group consisting of thermosetting polyester resins and thermosetting vinyl ester resins containing crosslinking monomers and having from about 5 to 15% by weight based on the total weight of the composition of a rubbery star copolymer having an average of from about 4 to 9 arms, having a Mn of from about 50,000 to 250,000, comprising from about 10 to 40% by weight of styrene and from 90 to 60% by weight of butadiene-1,3 and having a nucleus from an initiator (1) having a VPO Mn of from about 750 to 4,000, (2) having from 4 to 9 C-Li sites and (3) being the adduct of an aromatic compound selected from the group consisting of divinyl benzene and diisopropenyl benzene and mixtures thereof and RLi where R is selected from the group consisting of normal, secondary and tertiary alkyl and cycloalkyl radicals of from 2 to 20, or from 2 to 10, carbon atoms and mixtures thereof, the mole ratio of RLi to said aromatic compound being about 1:0.83.
Claim 2
Dependent Claim
175 words
A thermosetting composition selected from the group consisting of thermosetting polyester resins and thermosetting vinyl ester resins containing crosslinking monomers and having from about 5 to 15% by weight based on the total weight of the composition of a rubbery star copolymer having an average of from about 4 to 9 arms, having a Mn of from about 50,000 to 250,000, comprising from about 10 to 40% by weight of styrene and from 90 to 60% by weight of butadiene-1,3 and having a nucleus from an initiator (1) having a VPO Mn of from about 750 to 4,000, (2) having from 4 to 9 C-Li sites and (3) being the adduct of an aromatic compound selected from the group consisting of divinyl benzene and diisopropenyl benzene and mixtures thereof and RLi where R is selected from the group consisting of normal, secondary and tertiary alkyl and cycloalkyl radicals of from 2 to 20, or from 2 to 10, carbon atoms and mixtures thereof, the mole ratio of RLi to said aromatic compound being about 1:0.83.
Claim 3
Dependent Claim
27 words
A thermosetting composition according to claim 1 in which said star polymer is a block copolymer and where the end portions of the arms comprise polystyrene blocks.
Claim 4
Dependent Claim
15 words
A thermosetting composition according to claim 2 wherein the star polymer contains terminal carboxyl groups.
Claim 5
Dependent Claim
194 words
A molded thermoset glass fiber composition selected from the group consisting of thermoset polyester resin glass fiber compositions and thermoset vinyl ester resin glass fiber compositions having about 10 to 75% by weight of glass fibers and containing from about 5 to 15% by weight based on the total weight of the organic constitutents of the composition of a rubbery star copolymer having an average of from about 4 to 9 arms, a Mn of from about 50,000 to 250,000, comprising from about 10 to 40% by weight of styrene and from 90 to 60% by weight of butadiene-1,3 and having a nucleus from an initiator (1) having a VPO Mn of from about 750 to 4,000, (2) having from 4 to 9 C-Li sites and (3) being the adduct of an aromatic compound selected from the group consisting of divinyl benzene and diisopropenyl benzene and mixtures thereof and RLi where R is selected from the group consisting of normal, secondary and tertiary alkyl and cycloalkyl radicals of from 2 to 20, or from 2 to 10, carbon atoms and mixtures thereof, the mole ratio of RLi to said aromatic compound being about 1:0.83.
Claim 6
Dependent Claim
194 words
A molded thermoset glass fiber composition selected from the group consisting of thermoset polyester resin glass fiber compositions and thermoset vinyl ester resin glass fiber compositions having about 10 to 75% by weight of glass fibers and containing from about 5 to 15% by weight based on the total weight of the organic constitutents of the composition of a rubbery star copolymer having an average of from about 4 to 9 arms, a Mn of from about 50,000 to 250,000, comprising from about 10 to 40% by weight of styrene and from 90 to 60% by weight of butadiene-1,3 and having a nucleus from an initiator (1) having a VPO Mn of from about 750 to 4,000, (2) having from 4 to 9 C-Li sites and (3) being the adduct of an aromatic compound selected from the group consisting of divinyl benzene and diisopropenyl benzene and mixtures thereof and RLi where R is selected from the group consisting of normal, secondary and tertiary alkyl and cycloalkyl radicals of from 2 to 20, or from 2 to 10, carbon atoms and mixtures thereof, the mole ratio of RLi to said aromatic compound being about 1:0.83.
Claim 7
Dependent Claim
29 words
A molded thermoset glass fiber composition according to claim 4 where said star copolymer is a block copolymer and where the end portions of the arms comprise polystyrene blocks.
Claim 8
Dependent Claim
19 words
A molded thermoset glass fiber composition according to claim 5 in which the star copolymer contains terminal carboxyl groups.
References Cited (Backward Citations)
US3674893A
Cited
US4329438A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |