Patent US2857339A successfully refreshed from Google Patents.
US2857339A
Expired / Lapsed
US
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Steeping method for preparing foamable styrene polymer particles containing rubbery isobutylene 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 19:35
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J9/16; C08J9/18; C08J2325/00; C08J2325/02; C08J2325/04; C08J2325/06; C08J2423/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
207 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 STRYRENE POLYMER COMPOSITION CONSISTING OF 100 PARTS OF A STYRENE POLYMER HAVING 1-20 PARTGS OF A RUBBERY ISOBUTYLENE POLYMER INTIMATELY INCORPORATED THROUGHOUT THE STYRENE POLYMER; SAID STYRENE POLYMER BEING SELECTED FROM THE GROUP CONSISTING OF (A) A HOMOPOLYMER OF A MONOMER SELECTED 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, ALPHAMETHYLSTYRENE, 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 AND MIXTURE THEREOF WITH UP TO 15 WEIGHT PERCENT OF BUTADIENE; SAID RUBBERY ISOBUTYLENE POLYMER BEING SELECTED FROM THE GROUP CONSISTING OF HOMOPOLYMERS OF ISOBUTYLENE AND RUBBERY INTERPOLYMERS OF AT LEAST 90 WEIGHT PERCENT ISOBUTYLENE WITH UP TO 10 WEIGHT PERCENT OF A CONJUGATED 1,3-DIENE OF THE GROUP CONSISTING OF BUTADIENCE, ISOPRENE AND MIXTURES THEREOF; SAID PARTICLES OF THE STRYRENE POLYMER COMPOSITION HAVING AN AVERAGE PARTICLE SIZE OF LESS THAN ABOUT 10 MESH.
Claim 2
Independent Claim
207 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 STRYRENE POLYMER COMPOSITION CONSISTING OF 100 PARTS OF A STYRENE POLYMER HAVING 1-20 PARTGS OF A RUBBERY ISOBUTYLENE POLYMER INTIMATELY INCORPORATED THROUGHOUT THE STYRENE POLYMER; SAID STYRENE POLYMER BEING SELECTED FROM THE GROUP CONSISTING OF (A) A HOMOPOLYMER OF A MONOMER SELECTED 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, ALPHAMETHYLSTYRENE, 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 AND MIXTURE THEREOF WITH UP TO 15 WEIGHT PERCENT OF BUTADIENE; SAID RUBBERY ISOBUTYLENE POLYMER BEING SELECTED FROM THE GROUP CONSISTING OF HOMOPOLYMERS OF ISOBUTYLENE AND RUBBERY INTERPOLYMERS OF AT LEAST 90 WEIGHT PERCENT ISOBUTYLENE WITH UP TO 10 WEIGHT PERCENT OF A CONJUGATED 1,3-DIENE OF THE GROUP CONSISTING OF BUTADIENCE, ISOPRENE AND MIXTURES THEREOF; SAID PARTICLES OF THE STRYRENE 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 |