US3891609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process to minimize yellowness in articles formed from acrylonitrile-styrene compositions
Assignee: EIDP Inc
•
Filing: 1974-05-02
•
Granted: 1975-06-24
•
Expires: 1994-05-02
Abstract
Abstract The development of yellowness in an article formed from an acrylonitrile-styrene (or styrene derivative) polymer composition is minimized by 1. COAGULATION OF THE POLYMER IN A PH environment of 6.0 to 7.5; and 2. MELT PROCESSING OF THE POLYMER COMPOSITION (AT A TEMPERATURE OF 200*C. to 260*C.) with moisture controlled in the composition either A. IN AN INITIAL RANGE OF 0.2 TO 1.5 WEIGHT PERCENT AND A FINAL RANGE OF 0.15 TO 0.4 WEIGHT PERCENT IMMEDIATELY PRIOR TO SOLIDIFICATION IN EQUIPMENT THAT PROVIDES EXTRACTION OF VOLATILES DURING PROCESSING, OR B. IN THE RANGE OF 0.15 TO 0.4 WEIGHT PERCENT IN EQUIPMENT THAT DOES NOT PROVIDE EXTRACTION OF VOLATILES. The formed article which is essentially free of bubbles is useful where barrier properties to oxygen or carbon dioxide are desirable, e.g., bottles for holding carbonated beverages.
Inventors
- 👤 Paul Dillon Wolfe
- 👤 Ronald Luther Saxton
- 👤 Donald Dean Cameron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:21
CPC Classifications
C; C08; C08J; C08J3/00; C08F; C08F279/00; C08F279/02; C08F279/04; C08F6/00; C08F6/14; C08F6/22; C08J3/12; C08J3/16; C08J5/00; C08L; C08L33/00; C08L33/18; C08L33/20; C08J2333/00; C08J2333/18; C08J2333/20
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
160 words
IN A PROCESS FOR FORMING A SHAPED ORTICLE MADE FROM A COMPOSITION CONTAINING A POLYMER FORMED FROM ACRYLONITRILE AND STYRENE, A STYRENE DERIVATIVE OR COMBINATION THEREOF, SAID COMPOSITION COMPRISING A. 65 TO 100 PERCENT BY WEIGHT OF A POLYMER CONSISTING ESSENTIALLY OF 67 TO 85 PERCENT BY WEIGHT ACRYLONITRILE POLYMERIZED UNITS AND 33 TO 15 PERCENT BY WEIGHT POLYMERTIZED UNITS DERIVED FROM STYRENE, A STYRENE DERIVATIVE OR COMBINATION THEREOF WHEREIN SAID STYRENE DERIVATIVE IS SELECTED FROM 4-METHYL STYRENE; 4-(T-BUTYL) STYRENE; 3METHYL STYRENE; 2,4-DIMETHYL STYRENE; 2,6-DIMETHYL STYRENE; 2,4-DISOPROPYLE STYRENE AND A-METHYL STYRENE; AND B. 0 TO 35 PERCENT BY WEIGHT GRAFTED RUBBER, THE GRAFTED RUBBER CONSISTING ESSENTIALLY OF 30 TO 50 PERCENT BY WEIGHT OF A GRAFT POLYMER CONSISTING OF 61 TO 85 PERCENT BY WEIGHT ACRYLONITRILE POLYMERIZED UNITS AND 39 TO 15 PERCENT BY WEIGHT POLYMERIZED UNITS OF STYRENE, SAID STYRENE DERIVATIVE OR COMBINATIONS THEREOF, AND 50 TO 70 PERCENT BY WEIGHT RUBBER; WHEREIN THE SHAPED ARTICLE IS FORMED BY
Claim 2
Dependent Claim
160 words
IN A PROCESS FOR FORMING A SHAPED ORTICLE MADE FROM A COMPOSITION CONTAINING A POLYMER FORMED FROM ACRYLONITRILE AND STYRENE, A STYRENE DERIVATIVE OR COMBINATION THEREOF, SAID COMPOSITION COMPRISING A. 65 TO 100 PERCENT BY WEIGHT OF A POLYMER CONSISTING ESSENTIALLY OF 67 TO 85 PERCENT BY WEIGHT ACRYLONITRILE POLYMERIZED UNITS AND 33 TO 15 PERCENT BY WEIGHT POLYMERTIZED UNITS DERIVED FROM STYRENE, A STYRENE DERIVATIVE OR COMBINATION THEREOF WHEREIN SAID STYRENE DERIVATIVE IS SELECTED FROM 4-METHYL STYRENE; 4-(T-BUTYL) STYRENE; 3METHYL STYRENE; 2,4-DIMETHYL STYRENE; 2,6-DIMETHYL STYRENE; 2,4-DISOPROPYLE STYRENE AND A-METHYL STYRENE; AND B. 0 TO 35 PERCENT BY WEIGHT GRAFTED RUBBER, THE GRAFTED RUBBER CONSISTING ESSENTIALLY OF 30 TO 50 PERCENT BY WEIGHT OF A GRAFT POLYMER CONSISTING OF 61 TO 85 PERCENT BY WEIGHT ACRYLONITRILE POLYMERIZED UNITS AND 39 TO 15 PERCENT BY WEIGHT POLYMERIZED UNITS OF STYRENE, SAID STYRENE DERIVATIVE OR COMBINATIONS THEREOF, AND 50 TO 70 PERCENT BY WEIGHT RUBBER; WHEREIN THE SHAPED ARTICLE IS FORMED BY
Claim 3
Dependent Claim
14 words
EMULSION POLYMERIZING IN THE PRESENCE OF A FREE RADICAL GENERATOR TO FORM SAID COMPOSITION
Claim 4
Dependent Claim
14 words
EMULSION POLYMERIZING IN THE PRESENCE OF A FREE RADICAL GENERATOR TO FORM SAID COMPOSITION
Claim 5
Dependent Claim
83 words
COAGULATING SAID POLYMER CCOMPOSITION IN AN ENVIROMENT MAINTAINED AT A PH OF 6.0 TO 7.5; AND II. MELT PROCESSING SAID POLYMER COMPOSITION AT: A. AN INITIAL MOISTURE CONTENT OF 0.2 TO 1.5 WEIGHT PERCENT AND RELEASING VOLATILES TO YEILD A SHAPED ARTICLE CONTAINING A MOISTURE CONTENT OF 0.15 TO 0.4 WEIGHT PERCENT IMMEDIATELY PRIOR TO SOLIDIFICATION OR B. A MOISTURE CONTENT OF 0.15 TO 0.4 WEIGHT PERCENT WITHOUT A SUBSTANTIAL RELEASE OF VOLATILES; WHEREBY YELLOWNESS IS MINIMIZED IN AN ESSENTIALLY BUBBLE FREE ARTICLE.
Claim 6
Dependent Claim
83 words
COAGULATING SAID POLYMER CCOMPOSITION IN AN ENVIROMENT MAINTAINED AT A PH OF 6.0 TO 7.5; AND II. MELT PROCESSING SAID POLYMER COMPOSITION AT: A. AN INITIAL MOISTURE CONTENT OF 0.2 TO 1.5 WEIGHT PERCENT AND RELEASING VOLATILES TO YEILD A SHAPED ARTICLE CONTAINING A MOISTURE CONTENT OF 0.15 TO 0.4 WEIGHT PERCENT IMMEDIATELY PRIOR TO SOLIDIFICATION OR B. A MOISTURE CONTENT OF 0.15 TO 0.4 WEIGHT PERCENT WITHOUT A SUBSTANTIAL RELEASE OF VOLATILES; WHEREBY YELLOWNESS IS MINIMIZED IN AN ESSENTIALLY BUBBLE FREE ARTICLE.
Claim 7
Dependent Claim
3 words
coagulating said composition;
Claim 8
Dependent Claim
3 words
coagulating said composition;
Claim 9
Dependent Claim
3 words
COAGULATING SAID COMPOSITION
Claim 10
Dependent Claim
3 words
COAGULATING SAID COMPOSITION
Claim 11
Dependent Claim
12 words
The process of claim 1 wherein said pH is 6.5 to 7.0.
Claim 12
Dependent Claim
19 words
The process of claim 1 wherein said initial moisture content in step II(a) is 0.5 to 1.0 weight percent.
Claim 13
Dependent Claim
18 words
MELT PROCESSING TO FORM A SHAPED ARTICLE AT A TEMPERATURE OF 200*C, TO 260*C; WHEREIN SAID IMPROVEMENT COMPRISES;
Claim 14
Dependent Claim
18 words
MELT PROCESSING TO FORM A SHAPED ARTICLE AT A TEMPERATURE OF 200*C, TO 260*C; WHEREIN SAID IMPROVEMENT COMPRISES;
Claim 15
Dependent Claim
102 words
melt processing to form a shaped article at a temperature of 200*C. to 260*C.; wherein said improvement comprises I. coagulating said polymer composition in an environment maintained at a pH of 6.0 to 7.5; and II. melt processing said polymer composition at: a. an initial moisture content of 0.2 to 1.5 weight percent and releasing volatiles to yield a shaped article containing a moisture content of 0.15 to 0.4 weight percent immediately prior to solidification or b. a moisture content of 0.15 to 0.4 weight percent without a substantial release of volatiles; whereby yellowness is minimized in an essentially bubble free article.
Claim 16
Dependent Claim
102 words
melt processing to form a shaped article at a temperature of 200*C. to 260*C.; wherein said improvement comprises I. coagulating said polymer composition in an environment maintained at a pH of 6.0 to 7.5; and II. melt processing said polymer composition at: a. an initial moisture content of 0.2 to 1.5 weight percent and releasing volatiles to yield a shaped article containing a moisture content of 0.15 to 0.4 weight percent immediately prior to solidification or b. a moisture content of 0.15 to 0.4 weight percent without a substantial release of volatiles; whereby yellowness is minimized in an essentially bubble free article.
Claim 17
Dependent Claim
19 words
The process of claim 3 wherein said moisture content immediately prior to solidification is 0.2 to 0.3 weight percent.
Claim 18
Dependent Claim
18 words
The process of claim 1 wherein said moisture content in step II(b) is 0.2 to 0.3 weight percent.
References Cited (Backward Citations)
US3451538A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |