US3966845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acrylic acid grafted polyolefins as nucleating agents for ungrafted polyolefins
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1974-05-22
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Granted: 1976-06-29
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Expires: 1994-05-22
Abstract
Abstract Polyolefins which have been modified by being graft polymerized with from about 1 to 15 weight percent of an acrylic acid or derivative thereof are outstanding nucleating agents when added to unmodified polyolefins in concentrations of about 0.1 to 15 weight percent.
Inventors
- 👤 Robert A. Van Brederode
- 👤 Robert A. Steinkamp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:19
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/098; C08L23/10; C08L51/00; C08L51/06; Y; Y10; Y10S; Y10S260/00; Y10S260/35
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
104 words
In an injection molding operation to produce thick shaped articles the method of improving the crystallization properties of crystallite forming C 2 to C 8 polyolefins which comprises: a. incorporating into said crystallite forming polyolefins from 0.1 to 15 weight percent of a nucleating agent consisting essentially of a grafted C 2 to C 8 polyolefin wherein said graft component comprises 0.1 to 15 weight percent of an acrylic acid. b. melting said crystallite forming polyolefin, and c. cooling the resulting blend to the temperature of crystallization of said blend and thus forming very small spherulites because of the presence of said nucleating agent.
Claim 2
Dependent Claim
104 words
In an injection molding operation to produce thick shaped articles the method of improving the crystallization properties of crystallite forming C 2 to C 8 polyolefins which comprises: a. incorporating into said crystallite forming polyolefins from 0.1 to 15 weight percent of a nucleating agent consisting essentially of a grafted C 2 to C 8 polyolefin wherein said graft component comprises 0.1 to 15 weight percent of an acrylic acid. b. melting said crystallite forming polyolefin, and c. cooling the resulting blend to the temperature of crystallization of said blend and thus forming very small spherulites because of the presence of said nucleating agent.
Claim 3
Dependent Claim
12 words
A method according to claim 1 wherein said polyolefin is crystalline polypropylene.
Claim 4
Dependent Claim
20 words
A method according to claim 1 wherein said nongrafted polyolefin is crystalline polypropylene and said grafted polyolefin is crystalline polypropylene.
Claim 5
Dependent Claim
24 words
A method according to claim 3 wherein said grafted acrylic acid is present in about 2 to 8 weight percent in said grafted polymer.
Claim 6
Dependent Claim
34 words
A method according to claim 4 wherein the total amount of grafted acrylic acid component in said polymer blend after addition of said grafted nucleating agent is from about 0.06 to 1 weight percent.
Claim 7
Dependent Claim
61 words
An injection molded thick shaped article polymeric composition of matter comprising: a. a major portion of crystalline C 2 to C 8 polyolefin; b. a minor portion sufficient to improve the nucleation properties of said polyolefin of a nucleating agent consisting of a grafted C 2 to C 8 polyolefin containing from 0.1 to 20 weight percent of grafted acrylic acid.
Claim 8
Dependent Claim
61 words
An injection molded thick shaped article polymeric composition of matter comprising: a. a major portion of crystalline C 2 to C 8 polyolefin; b. a minor portion sufficient to improve the nucleation properties of said polyolefin of a nucleating agent consisting of a grafted C 2 to C 8 polyolefin containing from 0.1 to 20 weight percent of grafted acrylic acid.
Claim 9
Dependent Claim
12 words
A composition according to claim 6 wherein said crystalline polymer is polypropylene.
Claim 10
Dependent Claim
23 words
A composition according to claim 7 wherein the quantity of said acrylic acid in said composition is about 0.06 to 1 weight percent.
Claim 11
Dependent Claim
49 words
An injection molded thick shaped article polymeric composition of matter comprising: a. a major proportion of crystalline polypropylene; b. about 0.1 to 15 weight percent of an acrylic acid grafted C 2 to C 8 polyolefin containing from about 0.1 to 15 weight percent of said grafted acrylic acid.
Claim 12
Dependent Claim
49 words
An injection molded thick shaped article polymeric composition of matter comprising: a. a major proportion of crystalline polypropylene; b. about 0.1 to 15 weight percent of an acrylic acid grafted C 2 to C 8 polyolefin containing from about 0.1 to 15 weight percent of said grafted acrylic acid.
Claim 13
Dependent Claim
12 words
A composition according to claim 9 wherein said polyolefin comprises crystalline polypropylene.
References Cited (Backward Citations)
US3207739A
Cited
JPS445087Y1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |