US3989771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubbermodified styrene polymers
Assignee: BP Corp North America Inc
•
Filing: 1975-04-30
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Granted: 1976-11-02
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Expires: 1995-04-30
Abstract
Abstract Addition of very small amounts of bromine or bromine-containing compounds in the preparation of rubber-modified vinyl aromatic polymers increase their impact resistance.
Inventors
- 👤 Robert A. Reith
- 👤 James Spanswick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:25
CPC Classifications
C; C08; C08F; C08F255/00; C08F255/02; C08F255/06; C08F279/00; C08F279/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
73 words
A method for producing an impact resistant polymer comprising: a. adding to a polymerization feedstock, comprising 2 to 20% polybutadiene, styrene-butadiene or ethylene-propylene-diene monomer rubber dissolved in a vinyl aromatic monomer, an effective amount between 0.01 to 0.5 weight percent of an additive selected from the group consisting of bromine and carbon tetrabromide; b. polymerizing the feedstock; and c. recovering the polymer, whereby the Izod value of the polymer is at least 0.6.
Claim 2
Independent Claim
73 words
A method for producing an impact resistant polymer comprising: a. adding to a polymerization feedstock, comprising 2 to 20% polybutadiene, styrene-butadiene or ethylene-propylene-diene monomer rubber dissolved in a vinyl aromatic monomer, an effective amount between 0.01 to 0.5 weight percent of an additive selected from the group consisting of bromine and carbon tetrabromide; b. polymerizing the feedstock; and c. recovering the polymer, whereby the Izod value of the polymer is at least 0.6.
Claim 3
Dependent Claim
13 words
The method of claim 1 where the vinyl aromatic monomer is styrene monomer.
Claim 4
Dependent Claim
16 words
The method of claim 2 where the feedstock is polymerized by the mass thermal polymerization technique.
Claim 5
Dependent Claim
11 words
The method of claim 3 where the additive is carbon tetrabromide.
Claim 6
Dependent Claim
10 words
The method of claim 3 where the additive is bromine.
Claim 7
Dependent Claim
11 words
The method of claim 3 where the rubber is EPDM rubber.
Claim 8
Dependent Claim
10 words
The method of claim 6 where the additive is bromine.
Claim 9
Dependent Claim
11 words
The method of claim 6 where the additive is carbon tetrabromide.
Claim 10
Dependent Claim
9 words
The product formed using the method of claim 5.
Claim 11
Dependent Claim
9 words
The product formed using the method of claim 7.
Claim 12
Dependent Claim
9 words
The product formed using the method of claim 6.
Claim 13
Dependent Claim
9 words
The product formed using the method of claim 8.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |