Extrudable fluoropolymer blends
First Claim
1. A melt processable fluorothermoplastic composition comprising a major amount of a first fluoropolymer, wherein the first fluoropolymer comprises a semi-crystalline fluorinated copolymer, and a minor amount of a second fluoropolymer effective to reduce melt defects in the composition, each fluoropolymer being selected from:
- (a) a semi-crystalline perfluorinated copolymer, (b) a fluoropolymer derived from interpolymerized units of at least one essentially perfluorinated monomer, at least one non-fluorinated hydrogen-containing monomer, and optionally, perfluorobutyl-ethylene and/or no more than about 1% by weight of other partially fluorinated monomers;
(c) a fluoropolymer derived from interpolymerized units of at least one partially-fluorinated monomer, and optionally at least one essentially perfluorinated monomer, and (d) an amorphous copolymer of tetrafluoroethylene and hexafluoropropylene;
wherein when the first fluoropolymer is selected from (a), the second fluoropolymer is a semi-crystalline fluoropolymer selected from (b) and/or (c);
when the first fluoropolymer is selected from (b), the second fluoropolymer is selected from (a), (c), and/or (d); and
when the first fluoropolymer is a copolymer selected from (c), the second fluoropolymer is selected from (a), (b), and/or (d);
with the proviso that, when the melt processable fluorothermoplastic composition comprises one or more copolymers selected from (c), the melt processable fluorothermoplastic composition comprises either;
at least about 80% by weight of copolymers selected from (c) or no more than about 5% by weight of copolymers selected from (c).
1 Assignment
0 Petitions
Accused Products
Abstract
Provided is a melt processable fluorothermoplastic composition comprising a major amount of a first semi-crystalline fluorinated copolymer and a minor amount of a second fluoropolymer effective to reduce melt defects in the composition. Each fluoropolymer is selected from four classes. The first class, (a), includes a semi-crystalline perfluorinated copolymer. The second class, (b), includes a fluoropolymer derived from interpolymerized units of at least one essentially perfluorinated monomer and at least one non-fluorinated hydrogen-containing monomer. The third class, (c), includes a fluoropolymer derived from interpolymerized units of at least one partially-fluorinated monomer, and optionally at least one essentially perfluorinated monomer. The second fluoropolymer is selected from a category other than the category in which the first fluoropolymer is selected. The minor component also can include interpolymerized units of a PAVE, and/or a PAOVE. A method of improving surface properties in a fluoropolymer extrudate is also provided.
-
Citations
30 Claims
-
1. A melt processable fluorothermoplastic composition comprising a major amount of a first fluoropolymer, wherein the first fluoropolymer comprises a semi-crystalline fluorinated copolymer, and a minor amount of a second fluoropolymer effective to reduce melt defects in the composition, each fluoropolymer being selected from:
-
(a) a semi-crystalline perfluorinated copolymer, (b) a fluoropolymer derived from interpolymerized units of at least one essentially perfluorinated monomer, at least one non-fluorinated hydrogen-containing monomer, and optionally, perfluorobutyl-ethylene and/or no more than about 1% by weight of other partially fluorinated monomers;
(c) a fluoropolymer derived from interpolymerized units of at least one partially-fluorinated monomer, and optionally at least one essentially perfluorinated monomer, and (d) an amorphous copolymer of tetrafluoroethylene and hexafluoropropylene;
wherein when the first fluoropolymer is selected from (a), the second fluoropolymer is a semi-crystalline fluoropolymer selected from (b) and/or (c);
when the first fluoropolymer is selected from (b), the second fluoropolymer is selected from (a), (c), and/or (d); and
when the first fluoropolymer is a copolymer selected from (c), the second fluoropolymer is selected from (a), (b), and/or (d);
with the proviso that, when the melt processable fluorothermoplastic composition comprises one or more copolymers selected from (c), the melt processable fluorothermoplastic composition comprises either;
at least about 80% by weight of copolymers selected from (c) or no more than about 5% by weight of copolymers selected from (c).- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 29, 30)
-
-
24. A melt processable fluorothermoplastic composition comprising a major amount of a first fluoropolymer, wherein the first fluoropolymer comprises semi-crystalline fluorinated copolymer, and a minor amount of a second fluoropolymer effective to reduce melt defects in the composition, the second fluoropolymer being selected from:
-
(a) an amorphous fluorinated copolymer derived from interpolymerized units of a perfluoro (alkoxy vinyl) ether and a comonomer which may be partially or fully fluorinated; and
/or(b) up to about 5% by weight of an amorphous fluorinated copolymer derived from interpolymerized units of at least 3 mole percent (mol %) of an hydrogen containing comonomer, and a perfluoro (alkoxy vinyl) ether. - View Dependent Claims (25, 26, 27, 28)
-
Specification