US3957915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Translucent impact polystyrene
Assignee: Standard Oil Co
•
Filing: 1975-04-30
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Granted: 1976-05-18
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Expires: 1995-04-30
Abstract
Abstract Translucent rubber-modified styrene polymers are prepared by adding 0.005 to 0.5% of 1,2-dibromo-2-phenylpropane or methyl-2,3-dibromo-3-phenylpropionate to the polymerization feedstock.
Inventors
- 👤 James Spanswick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:50
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
81 words
A method for producing a translucent, impact resistant polymer comprising: a. adding to a polymerization feedstock, comprising 2 to 20% polybutadiene or styrene-butadiene rubber dissolved in a vinyl aromatic, an effective amount between 0.005 to 0.5 weight percent of an additive selected from the group consisting of 1,2-dibromo-2-phenylpropane and methyl-2,3-dibromo-3-phenylpropionate; b. polymerizing the feedstock; and c. recovering the polymer, whereby the Izod value of the polymer is at least 0.6 and the translucency index of the polymer is at least 7.
Claim 2
Independent Claim
81 words
A method for producing a translucent, impact resistant polymer comprising: a. adding to a polymerization feedstock, comprising 2 to 20% polybutadiene or styrene-butadiene rubber dissolved in a vinyl aromatic, an effective amount between 0.005 to 0.5 weight percent of an additive selected from the group consisting of 1,2-dibromo-2-phenylpropane and methyl-2,3-dibromo-3-phenylpropionate; b. polymerizing the feedstock; and c. recovering the polymer, whereby the Izod value of the polymer is at least 0.6 and the translucency index of the polymer is at least 7.
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 using the mass thermal polymerization technique.
Claim 5
Dependent Claim
13 words
The method of claim 3 whereby the rubber is a solution polybutadiene rubber.
Claim 6
Dependent Claim
10 words
The method of claim 3 wherein the additive is 1,2-dibromo-2-phenylpropane.
Claim 7
Dependent Claim
17 words
The method of claim 5 where between 0.005 and 0.1% of 1,2-dibromo-2-phenylpropane is added to the feedstock.
Claim 8
Dependent Claim
15 words
The method of claim 5 where about 0.008% of 1,2-dibromo2-phenylpropane is added to the feedstock.
Claim 9
Dependent Claim
49 words
A translucent, impact resistant polystyrene with an Izod value of at least 0.6 and a translucency index of at least 7 containing from 2 to 20% of a polybutadiene or styrene-butadiene rubber and from 0.005 to 0.5% of an additive selected from the group consisting of 1,2-dibromo-2-phenylpropane and methyl-2,3-dibromo-3-phenylpropionate.
Claim 10
Dependent Claim
49 words
A translucent, impact resistant polystyrene with an Izod value of at least 0.6 and a translucency index of at least 7 containing from 2 to 20% of a polybutadiene or styrene-butadiene rubber and from 0.005 to 0.5% of an additive selected from the group consisting of 1,2-dibromo-2-phenylpropane and methyl-2,3-dibromo-3-phenylpropionate.
Claim 11
Dependent Claim
13 words
The polystyrene of claim 8 which contains from 0.005 to 0.1% of 1,2-dibromo-2-phenylpropane.
Claim 12
Dependent Claim
13 words
The polystyrene of claim 9 where the rubber is a solution polybutadiene rubber.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |