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US 5,492,946 AGranted
Liquid crystalline polymer blends and molded articles therefrom
AssigneeAmoco Corporation
InventorsPaul J. Huspeni, John F. Petry, Roger W. Nelson, Steven R. Dunkle
Life of this patent
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Abstract
A molded article having improved weld line strength, fabricated from a polymer blend composition comprising at least one liquid crystalline polymer and at least one additional polymer, wherein the composition has a crystallization rate lower than said at least one liquid crystalline polymer.
Claims13
A polymeric blend composition comprising:
- a first component which comprises a liquid crystalline polyester resin comprising the following repeating units (1), (2), (3), 4) and (5):
- ##STR22## wherein the ratio of total number of units (1) to the total number of units (2) is from about 1.4:1 to about 10:1;
- the ratio of the total number of units 4) to the total number of units (5) is from about 3:1 to about 21:1;
- and the ratio of the total number of units (3) to the sum of the total number of units (1) and (2) is from about 0.6:1 to about 7:1;
- and
- a second polymeric component which comprises a wholly aromatic polyester comprising at least one recurring unit having the following general formula:
- ##STR23## wherein --Ar-- is selected from the group consisting of:
- ##STR24## where --X.sub.1 -- and --X.sub.2 -- are independently selected from the group consisting of --O-- and --CO--;
- the blend exhibiting a crystallization rate which is lower than the crystallization rate of at least one of the liquid crystalline polyesters thereof;
- and
- wherein the blend further comprises filler in an mount of from about 1 to about 70 percent by weight of the blend;
- the filler comprises at least one material selected from the group consisting of glass fibers, asbestos, graphitic carbon fibers, amorphous carbon fibers, synthetic polymeric fibers, aluminum fibers, aluminum silicate fibers, oxide of aluminum fibers, titanium fibers, magnesium fibers, rock wool fibers, steel fibers, tungsten fibers, cotton, wool, and wood cellulose fibers, calcium silicate, silica, clays, talc, mica, carbon black, titanium dioxide, wollastonite, polytetrafluoroethylene, graphite, alumina trihydrate, sodium aluminum carbonate, barium ferrite, and glass beads.
9 more elements
A polymeric blend composition comprising:
- a first component which comprises a liquid crystalline polyester resin comprising the following repeating units (1), (2), (3), (4) and (5):
- ##STR25## wherein the ratio of total number of units (1) to the total number of units (2) is from about 1.4:1 to about 10:1;
- the ratio of the total number of units (4) to the total number of units (5) is from about 3:1 to about 21:1;
- and the ratio of the total number of units (3) to the sum of the total number of units (1) and (2) is from about 0.6:1 to about 7:1;
- and
- a second polymeric component which comprises repeating units (6) and (7):
- ##STR26## wherein said units may be substituted by one or more C.sub.1 to C.sub.4 alkyl groups, C.sub.1 to C.sub.4 alkoxy groups, or halogen atoms;
- and wherein the ratio of the number of units (6) to units (7) is from about 1:9 to about 9:1;
- the blend exhibiting a crystallization rate which is lower than the crystallization rate of at least one of the liquid crystalline polyesters thereof;
- and
- wherein the blend further comprises filler in an mount of from about 1 to about 70 percent by weight of the blend;
- and the filler comprises at least one material selected from the group consisting of glass fibers, asbestos, graphitic carbon fibers, amorphous carbon fibers, synthetic polymeric fibers, aluminum fibers, aluminum silicate fibers, oxide of aluminum fibers, titanium fibers, magnesium fibers, rock wool fibers, steel fibers, tungsten fibers, cotton, wool, and wood cellulose fibers, calcium silicate, silica, clays, talc, mica, carbon black, titanium dioxide, wollastonite, polytetrafluoroethylene, graphite, alumina trihydrate, sodium aluminum carbonate, barium ferrite, and glass beads.
9 more elements
A polymeric blend composition comprising:
- a first component which comprises a liquid crystalline polyester resin comprising the following repeating units (1), (2), (3), 4) and (5):
- ##STR27## wherein the ratio of total number of units (1) to the total number of units (2) is from about 1.4:1 to about 10:1;
- the ratio of the total number of units (4) to the total number of units (5) is from about 3:1 to about 21:1;
- and the ratio of the total number of units (3) to the sum of the total number of units (1) and (2) is from about 0.6:1 to about 7:1;
- and
- a second component which comprises a liquid crystalline polyester resin different from the polyester resin of the first component;
- consisting essentially of repeating units (8), (9), (10) and (11):
- ##STR28## where --Ar.sub.1 -- is at least one member selected from the group consisting of:
- ##STR29## wherein unit (8) is derived from at least one member selected from the group consisting of terephthalic acid and isophthalic acid and the sum of the number of units (8) is approximately equal to the number of units (11);
- the blend exhibiting a crystallization rate which is lower than the crystallization rate of at least one of the liquid crystalline polyesters thereof;
- and
- wherein the blend further comprises filler in an mount of from about 1 to about 70 percent by weight of the blend;
- and the filler comprises at least one material selected from the group consisting of glass fibers, asbestos, graphitic carbon fibers, amorphous carbon fibers, synthetic polymeric fibers, aluminum fibers, aluminum silicate fibers, oxide of aluminum fibers, titanium fibers, magnesium fibers, rock wool fibers, steel fibers, tungsten fibers, cotton, wool, and wood cellulose fibers, calcium silicate, silica, clays, talc, mica, carbon black, titanium dioxide, wollastonite, polytetrafluoroethylene, graphite, alumina trihydrate, sodium aluminum carbonate, barium ferrite, and glass beads.
10 more elements
Dependencies are inferred from the claim text.