Patent US4209597A successfully refreshed from Google Patents.
US4209597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for extruding and cross-linking olefin polymers, diolefin polymers, and copolymers of olefins and diolefins and copolymerizable monomers
Assignee: Gustavsberg AB
•
Filing: 1978-09-19
•
Granted: 1980-06-24
•
Expires: 1998-09-19
Abstract
Abstract A process is provided for extruding and cross-linking olefin polymers, diolefin polymers and copolymers thereof with other olefins, diolefins, or monomers copolymerizable therewith, using as the cross-linking agent an azo compound of the formula: ##STR1## wherein R 1 , R 2 , R 3 and R 4 are alkyl having from one to about six carbon atoms. The process is of particular application in the production of cross-linked pipe of such polymers and copolymers.
Inventors
- 👤 Sven A. T. Bremholt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:35
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/22; C08K5/23; Y; Y10; Y10S; Y10S425/00; Y10S425/016
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
104 words
A process is provided for extruding and cross-linking in shaped form olefin polymers, diolefin polymers and copolymers thereof with other olefins, diolefins, or monomers copolymerizable therewith, which comprises extruding the polymer in shaped form in the presence as cross-linking agent of an azo compound of the formula: ##STR9## wherein R 1 , R 2 , R 3 and R 4 are alkyl having from one to about six carbon atoms, and then heating the extruded polymer in shaped form at a temperature within the range from about 175° C. to about 275° C. to effect cross-linking reaction between the polymer and the azo compound.
Claim 2
Dependent Claim
104 words
A process is provided for extruding and cross-linking in shaped form olefin polymers, diolefin polymers and copolymers thereof with other olefins, diolefins, or monomers copolymerizable therewith, which comprises extruding the polymer in shaped form in the presence as cross-linking agent of an azo compound of the formula: ##STR9## wherein R 1 , R 2 , R 3 and R 4 are alkyl having from one to about six carbon atoms, and then heating the extruded polymer in shaped form at a temperature within the range from about 175° C. to about 275° C. to effect cross-linking reaction between the polymer and the azo compound.
Claim 3
Dependent Claim
15 words
A process according to claim 1 in which the shaped form is pipe or tubing.
Claim 4
Dependent Claim
18 words
A process according to claim 1 in which the shaped form is an insulation of an electric cable.
Claim 5
Dependent Claim
13 words
A process according to claim 1 in which the polymer is a poly-α-olefin.
Claim 6
Dependent Claim
12 words
A process according to claim 1 in which the poly-α-olefin is polyethylene.
Claim 7
Dependent Claim
14 words
A process according to claim 1 in which the polymer is ethylene-vinyl acetate copolymer.
Claim 8
Dependent Claim
14 words
A process according to claim 1 in which the polymer is ethylene propylene rubber.
Claim 9
Dependent Claim
13 words
A process according to claim 1 in which the polymer is ethylene-propylene-ethylidenenorbornene rubber.
Claim 10
Dependent Claim
13 words
A process according to claim 1 in which the polymer is styrene-butadiene rubber.
Claim 11
Dependent Claim
13 words
A process according to claim 1 in which the polymer is polybutadiene rubber.
Claim 12
Dependent Claim
31 words
A process according to claim 1 in which the amount of azo cross-linking agent is within the range from about 0.05 to about 10% be weight of the polymer or copolymer.
Claim 13
Dependent Claim
31 words
A process according to claim 11 in which the amount of azo cross-linking agent is within the range from about 0.5 to about 3% by weight of the polymer or copolymer.
Claim 14
Dependent Claim
70 words
A process according to claim 1 in which the polymer composition includes at least one adjunct for extruded material selected from the group consisting of lubricants, antioxidants, ultraviolet light stabilizers, heat stabilizers, impact-modifiers, fillers, pigments, plasticizers and extenders, each in amounts of within the range from about 0.1 to about 10% by weight of the polymer, and in a total amount not exceeding about 50% by weight of the polymer.
Claim 15
Dependent Claim
24 words
A process according to claim 13 in which the antioxidant is selected from the group consisting of phenols, aromatic amines, aminophenols and polymerized hydroquinolines.
Claim 16
Dependent Claim
13 words
A process according to claim 13 in which the filler is carbon black.
Claim 17
Dependent Claim
35 words
A process according to claim 1 in which the extrudable composition is prepared by blending the polymer and azo compound and hot-mixing at a temperature within the range from about 30° to about 200° C.
Claim 18
Dependent Claim
34 words
A process according to claim 16 in which after hot-mixing the material is cooled to a temperature within the range from about 60° to about 30° C. and is then fed to the extruder.
Claim 19
Dependent Claim
37 words
A process according to claim 1 in which the heating temperature after extrusion is within the range from about 175° C. to about 275° C., for a time within the range from several minutes to two hours.
Claim 20
Dependent Claim
15 words
A process according to claim 18 in which the heating is applied in an oven.
Claim 21
Dependent Claim
21 words
A process according to claim 18 in which the heating is applied by immersion in a bath of nonvolatile inert liquid.
Claim 22
Dependent Claim
16 words
A process according to claim 20 in which the liquid bath is a molten salt bath.
Claim 23
Dependent Claim
37 words
A process according to claim 20 in which the extruded form during immersion is pressurized internally by addition of an inert gas at a pressure within the range from about 5 to about 250 g/cm 2 .
Claim 24
Dependent Claim
58 words
Extruded pipe or tubing comprising a polymer selected from the group consisting of olefin polymers, diolefin polymers, and copolymers thereof with other olefins, diolefins, or monomers copolymerizable therewith, cross-linked with an azo compound of the formula: ##STR10## wherein R 1 , R 2 , R 3 and R 4 alkyl having from one to about six carbon atoms.
Claim 25
Dependent Claim
58 words
Extruded pipe or tubing comprising a polymer selected from the group consisting of olefin polymers, diolefin polymers, and copolymers thereof with other olefins, diolefins, or monomers copolymerizable therewith, cross-linked with an azo compound of the formula: ##STR10## wherein R 1 , R 2 , R 3 and R 4 alkyl having from one to about six carbon atoms.
Claim 26
Dependent Claim
15 words
Extruded pipe or tubing according to claim 23 in which the polymer is a poly-α-olefin.
Claim 27
Dependent Claim
14 words
Extruded pipe or tubing according to claim 24 in which the poly-α-olefin is polyethylene.
Claim 28
Dependent Claim
16 words
Extruded pipe or tubing according to claim 23 in which the polymer is ethylene-vinyl acetate copolymer.
Claim 29
Dependent Claim
16 words
Extruded pipe or tubing according to claim 23 in which the polymer is ethylene propylene rubber.
Claim 30
Dependent Claim
15 words
Extruded pipe or tubing according to claim 23 in which the polymer is ethylene-propylene-ethylidenenorbornene rubber.
Claim 31
Dependent Claim
15 words
Extruded pipe or tubing according to claim 23 in which the polymer is styrene-butadiene rubber.
Claim 32
Dependent Claim
15 words
Extruded pipe or tubing according to claim 23 in which the polymer is polybutadiene rubber.
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) | 1983-06-24 | 1983-12-24 | 1984-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-24 | 1987-12-24 | 1988-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-24 | 1991-12-24 | 1992-06-24 | $7700.00 | Window Closed / Lapsed |