US2857340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steeping method for preparing foamable styrene polymer particles containing a rubbery diene polymer
Assignee: Monsanto Chemicals Ltd
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Filing: 1955-12-28
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Granted: 1958-10-21
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Expires: 1975-12-28
Abstract
No abstract record available.
Inventors
- 👤 Robert E Colwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:36
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/16; C08J9/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
197 words
THE METHOD FOR PREPARING FOAMABLE PARTICLES OF A STYRENE POLYMER WHICH CONSISTS OF STEEPING PARTICLES OF A STYRENE POLYMER COMPOSITION IN A LIQUID ALIPHATIC HYDROCARBON BOILING WITHIN THE RANGE OF ABOUT 10-80*C.; SAID STYRENE POLYMER COMPOSITION CONSISTING OF 100 PARTS OF A STYRENE POLYMER HAVING 1-20 PARTS OF A RUBBERY DIENE POLYMER INTIMATELY INCORPORATED THROUGHOUT THE STYRENE POLYMER; SAID STYRENE POLYMER BEING SELECTED FROM THE GROUP CONSISTING OF (A) A HOMOPOLYMER OF A MONOMER SELECGTED FROM THE GROUP CONSISTING OF STYRENE, VINYL TOLUENE, P-ETHYLSTYRENE AND 2,4-DIMETHYLSTYRENE, (B) AN INTERPOLYMER CONSISTING SOLELY OF AT LEAST 2 MONOMERS SELECTED FROM THE GROUP CONSISTING OF STYRENE, ALPHA-METHYLSTYRENE, VINYL TOLUENE, P-ETHYLSTYRENE AND 2,4-DIMETHYLSTYRENE, AND (C) AN INTERPOLYMER OF AT LEAST 85 WEIGHT PERCENT OF A MONOMER SELECTED FROM THE GROUP CONSISTING OF STYRENE, ALPHA-METHYLSTYRENE, VINYL TOLUENE, P-ETHYLSTYRENE, 2,4-DIMETHYLSTYRENE, VINYL TOLUENE, P-ETHYLSTYTO 15 WEIGHT PERCENT OF BUTADIENE; SAID RUBBERY DIENE POLYMER BEING SELECTED FROM THE GROUP CONSISTING OF NATURAL RUBBER, HOMOPOLYMERS OF CONJUGATED 1,3-DIENES, AND INTERPOLYMERS OF AT LEAST 30 WEIGHT PERCENT OF A CONJUGATED 1,3-DIENE WITH UP TO 70 WEIGHT PERCENT OF STYRENE; SAID PARTICLES OF THE STYRENE POLYMER COMPOSITION HAVING AN AVERAGE PARTICLE SIZE OF LESS THAN ABOUT 10 MESH.
Claim 2
Independent Claim
197 words
THE METHOD FOR PREPARING FOAMABLE PARTICLES OF A STYRENE POLYMER WHICH CONSISTS OF STEEPING PARTICLES OF A STYRENE POLYMER COMPOSITION IN A LIQUID ALIPHATIC HYDROCARBON BOILING WITHIN THE RANGE OF ABOUT 10-80*C.; SAID STYRENE POLYMER COMPOSITION CONSISTING OF 100 PARTS OF A STYRENE POLYMER HAVING 1-20 PARTS OF A RUBBERY DIENE POLYMER INTIMATELY INCORPORATED THROUGHOUT THE STYRENE POLYMER; SAID STYRENE POLYMER BEING SELECTED FROM THE GROUP CONSISTING OF (A) A HOMOPOLYMER OF A MONOMER SELECGTED FROM THE GROUP CONSISTING OF STYRENE, VINYL TOLUENE, P-ETHYLSTYRENE AND 2,4-DIMETHYLSTYRENE, (B) AN INTERPOLYMER CONSISTING SOLELY OF AT LEAST 2 MONOMERS SELECTED FROM THE GROUP CONSISTING OF STYRENE, ALPHA-METHYLSTYRENE, VINYL TOLUENE, P-ETHYLSTYRENE AND 2,4-DIMETHYLSTYRENE, AND (C) AN INTERPOLYMER OF AT LEAST 85 WEIGHT PERCENT OF A MONOMER SELECTED FROM THE GROUP CONSISTING OF STYRENE, ALPHA-METHYLSTYRENE, VINYL TOLUENE, P-ETHYLSTYRENE, 2,4-DIMETHYLSTYRENE, VINYL TOLUENE, P-ETHYLSTYTO 15 WEIGHT PERCENT OF BUTADIENE; SAID RUBBERY DIENE POLYMER BEING SELECTED FROM THE GROUP CONSISTING OF NATURAL RUBBER, HOMOPOLYMERS OF CONJUGATED 1,3-DIENES, AND INTERPOLYMERS OF AT LEAST 30 WEIGHT PERCENT OF A CONJUGATED 1,3-DIENE WITH UP TO 70 WEIGHT PERCENT OF STYRENE; SAID PARTICLES OF THE STYRENE POLYMER COMPOSITION HAVING AN AVERAGE PARTICLE SIZE OF LESS THAN ABOUT 10 MESH.
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) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |