US3876613A
Expired / Lapsed
US
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Rotational molding and compositions therefor
Assignee: Phillips Petroleum Co
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Filing: 1972-12-27
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Granted: 1975-04-08
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Expires: 1992-12-27
Abstract
Abstract Polymers of ethylene are rotationally molded and crosslinked to produce molded articles having high strength utilizing compositions including an ester of thiodipropionic acid in addition to the crosslinking agent.
Inventors
- 👤 Donald G Needham
- 👤 George R Hill
- 👤 Robert J Martinovich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:42
CPC Classifications
B; B29; B29C; B29C41/00; B29C41/003; C; C08; C08K; C08K5/00; C08K5/04; C08K5/14; C08K5/36; C08K5/37; C08K5/372; B29C41/02; B29C41/04; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2105/00; B29K2105/24
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
88 words
A COMPOSITION OF MATTER FORMED BY INCORPORATING INTO A SOLID POLYMER SELECTED FROM THE GROUP CONSISTING OF ETHYLENE HOMOPOLYMERS, COPOLYMERS OF ETHYLENE AND AT LEAST ONE ACYCLIC MONO-1 OLEFIN HYDROCARBON HAVING 3 TO 8 CARBON ATOMS PER MOLECULE, AND MIXTURES THEREOF, HAVING A MELT INDEX OF AT LEAST ABOUT 10, A DENSITY IN THE RANGE OF 0.920 - 0.970, AND A MOLECULAR WEIGHT DISTRIBUTION NOT GREATER THAN ABOUT 7, A. A CROSSLINKING AMOUNT OF AN ACETYLENIC DIPEROXY COMPOUND SELECTED FROM THE GROUP CONSISTING OF HEXYNES HAVING THE FORMULA
Claim 2
Dependent Claim
88 words
A COMPOSITION OF MATTER FORMED BY INCORPORATING INTO A SOLID POLYMER SELECTED FROM THE GROUP CONSISTING OF ETHYLENE HOMOPOLYMERS, COPOLYMERS OF ETHYLENE AND AT LEAST ONE ACYCLIC MONO-1 OLEFIN HYDROCARBON HAVING 3 TO 8 CARBON ATOMS PER MOLECULE, AND MIXTURES THEREOF, HAVING A MELT INDEX OF AT LEAST ABOUT 10, A DENSITY IN THE RANGE OF 0.920 - 0.970, AND A MOLECULAR WEIGHT DISTRIBUTION NOT GREATER THAN ABOUT 7, A. A CROSSLINKING AMOUNT OF AN ACETYLENIC DIPEROXY COMPOUND SELECTED FROM THE GROUP CONSISTING OF HEXYNES HAVING THE FORMULA
Claim 3
Dependent Claim
13 words
The composition of claim 1 wherein R.sub.1 and R.sub.2 are the same and
Claim 4
Dependent Claim
22 words
The composition of claim 2 wherein R.sub.1 and R.sub.2 are selected from the group consisting of lauryl, stearyl, myristyl, oleyl and ricinoleyl.
Claim 5
Dependent Claim
33 words
The composition of claim 1 wherein the ester of thiodipropionic acid is dilaurylthiodipropionate, the amount of the ester is 0.03-0.06 weight percent, the acetylenic diperoxide compound is 2,5-dimethyl-2,5-di(t-butylperoxy)hexyne-3 and the amount of the
Claim 6
Dependent Claim
12 words
A composition according to claim 4 wherein said solid polymer is an
Claim 7
Dependent Claim
24 words
A composition according to claim 4 wherein said solid polymer is a copolymer of ethylene and 1-butene having a density in the range of
Claim 8
Independent Claim
96 words
A method for producing hollow articles which comprises rotationally molding a composition of matter formed by incorporating into a solid polymer selected from the group consisting of ethylene homopolymers, copolymers of ethylene and at least one acyclic mono-1 olefin hydrocarbon having 3 to 8 carbon atoms per molecule, and mixtures thereof, having a melt index of at least about 10, a density in the range of 0.920-0.970, and a molecular weight distribution not greater than about 7, a. a crosslinking amount of an acetylenic diperoxy compound selected from the group consisting of hexynes having the formula
Claim 9
Independent Claim
96 words
A method for producing hollow articles which comprises rotationally molding a composition of matter formed by incorporating into a solid polymer selected from the group consisting of ethylene homopolymers, copolymers of ethylene and at least one acyclic mono-1 olefin hydrocarbon having 3 to 8 carbon atoms per molecule, and mixtures thereof, having a melt index of at least about 10, a density in the range of 0.920-0.970, and a molecular weight distribution not greater than about 7, a. a crosslinking amount of an acetylenic diperoxy compound selected from the group consisting of hexynes having the formula
Claim 10
Dependent Claim
13 words
The method according to claim 7 wherein R.sub.1 and R.sub.2 are the same
Claim 11
Dependent Claim
22 words
The method according to claim 8 wherein R.sub.1 and R.sub.2 are selected from the group consisting of lauryl, stearyl, myristyl, oleyl and
Claim 12
Dependent Claim
35 words
The method according to claim 7 wherein the ester of thiodipropionic acid is dilaurylthiodipropionate, the amount of the ester is 0.03- 0.06 weight percent, the acetylenic diperoxide compound is 2,5-dimethyl-2,5-di(t-butylperoxy)hexyne-3 and the amount of the
Claim 13
Dependent Claim
12 words
The method according to claim 10 wherein said solid polymer is an
Claim 14
Dependent Claim
25 words
The method according to claim 10 wherein said solid polymer is a copolymer of ethylene and 1-butene having a density in the range of 0.940-0.970.
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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |