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US 10,519,286 B2Granted
Polyolefin pipe
AssigneeUponor Innovation AB
InventorsJan Ericsson, Todd Menssen
Life of this patent
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Abstract
This invention relates to a polymeric pipe, and more particularly a polymeric pipe where the pipe comprises a crosslinked polyolefin formed from extruded polyolefin comprising a photoinitiator. More particularly, this invention relates to the manufacturing of plastic pipes and tubing by utilizing co-rotating twin screw extrusion combined with photo-induced cross-linking, of thermoplastic polymers such as polyethylene, to produce PEX pipes and tubing.
Claims30
A polymeric pipe formed from:
- a polyolefin structural polymer;
- and
- a photoinitiator in an amount of 0.02 to 3% by weight,
- wherein the photoinitiator is a compound of formula I:
- wherein:
- R1 is selected from the group consisting of —C4-C24 alkyl, —(CH2)m(C2-C24-m alkenyl), —(CH2)m(C2-C24-m alkynyl), —C4-C24 haloalkyl, —(CH2)m(C2-C24-m haloalkenyl), —(CH2)m(C2-C24-m haloalkynyl), and —(CH2)n[O(CH2)p]q(CH2)rR4;
- R2 is selected from the group consisting of —H and —O—R3;
- R3 is selected from the group consisting of —C4-C24 alkyl, —(CH2)m(C2-C24-m alkenyl), —(CH2)mC2-C24-m alkynyl), —C4-C24 haloalkyl, —(CH2)m(C2-C24-m haloalkenyl), —(CH2)m(C2-C24-m haloalkynyl), and —(CH2)n[O(CH2)p]q(CH2)rR5;
- R4 and R5 are independently selected from the group consisting of —H and —O—R6;
- R6 is selected from the group consisting of —H, —C1-C18 alkyl, —(CH2)s(C2-C18-s alkenyl), and —(CH2)s(C2-C18-s alkynyl);
- m is 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21 or 22;
- n is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12;
- p is 2, 3, 4, 5 or 6;
- q is 2, 3, 4, 5, 6, 7, 8, 9, or 10;
- r is 0, 1 or 2;
- s is 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or 16;
- and
- wherein when R2 is —H, R1 comprises at least 7 carbon atoms.
15 more elements
A method of producing a cross-linked polyolefin pipe comprising:
- extrusion of a mixture from a co-rotating twin screw extruder to form an extruded pipe;
- and
- cross-linking a polyolefin structural polymer by irradiating the extruded pipe with UV radiation,
- wherein the extrusion mixture comprises the polyolefin structural polymer and a photoinitiator in an amount of 0.02 to 3% by weight;
- wherein the photoinitiator is a compound of formula I:
- wherein:
- R1 is selected from the group consisting of —C4-C24 alkyl, —(CH2)m(C2-C24-m alkenyl), —(CH2)m(C2-C24-m alkynyl), —C4-C24 haloalkyl, —(CH2)m(C2-C24-m haloalkenyl), —(CH2)m(C2-C24-m haloalkynyl), and —(CH2)n[O(CH2)p]q(CH2)rR4;
- R2 is selected from the group consisting of —H and —O—R3;
- R3 is selected from the group consisting of —C4-C24 alkyl, —(CH2)m(C2-C24-m alkenyl), —(CH2)m(C2-C24-m alkynyl), —C4-C24 haloalkyl, —(CH2)m(C2-C24-m haloalkenyl), —(CH2)m(C2-C24-m haloalkynyl), and —(CH2)n[O(CH2)p]q(CH2)rR5;
- R4 and R5 are independently selected from the group consisting of —H and —O—R6;
- R6 is selected from the group consisting of —H, —C1-C18 alkyl, —(CH2)s(C2-C18-s alkenyl), and —(CH2)s(C2-C18-s alkynyl);
- m is 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21 or 22;
- n is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12;
- p is 2, 3, 4, 5 or 6;
- q is 2, 3, 4, 5, 6, 7, 8, 9 or 10;
- r is 0, 1 or 2;
- s is 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or 16;
- and
- wherein when R2 is —H, R1 comprises at least 7 carbon atoms.
16 more elements
Dependencies are inferred from the claim text.