Crystalline polyamide composition from dicarboxylic acid mixture and diamine
AssigneeAmoco Corporation
InventorsWassily Poppe, Yu-Tsai Chen, Larry W. Autry, Joel A. Richardson, David P. Sinclair
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Abstract
Novel crystalline polyamides having high heat deflection temperatures when filled are prepared from aliphatic diamines and either mixtures of terephthalic acid and adipic acid or mixtures of terephthalic acid, isophthalic acid and adipic acid. The mole ratio of aliphatic diamine to terephthalic acid, isophthalic acid, and adipic acid is in the range of about 100:65-95:25-0:35-5. The polyamides can be filled with about 10 to about 60 parts by weight of a filler. The mechanical properties of these polyamides are largely unaffected by absorbed water.
Claims30
A resinous polyamide comprising the following recurring units:
- ##STR2## wherein the mole ratio of the dicarboxylic acid moieties in the A:B:C units is about 65-90:25-0:35-5 with the proviso that the mole ratio of the dicarboxylic acid moieties in the B:C units is less than 3:1 and wherein R, R.sub.1, and R.sub.2 are, independently, divalent aliphatic hydrocarbyl radicals of 2 to 14 carbon atoms.
A filled composition comprising 90 to 40 parts by weight of the polyamide of claim 1 and 10 to 60 parts by weight of mineral fiber.
A filled injection moldable polyamide composition wherein said polyamide comprises the following recurring units:
- ##STR3## wherein the mole ratio of the dicarboxylic acid moieties in the A:B:C units is about 65-90:25-0:35-5 with the proviso that the mole ratio of the dicarboxylic acid moieties in the B:C units is less than 3:1, wherein R, R.sub.1, and R.sub.2 are, independently, divalent aliphatic hydrocarbyl radicals of 2 to 14 carbon atoms, wherein about 10 to about 60 percent by weight of the filled composition comprises a filler selected from the group consisting of glass fibers, glass beads, or graphite fibers or mixtures of the same and wherein the filled polyamide composition has a heat deflection temperature in excess of about 245.degree. C.
A crystalline polyamide copolymer consisting essentially of the following recurring units:
- ##STR4## wherein the mole ratio of dicarboxylic acid moieties in I:II is about 65:35 to 95:5, wherein R and R.sub.2 are aliphatic hydrocarbyl radicals of 2 to 14 carbon atoms.
A filled injection moldable polyamide copolymer composition, said copolymer comprising the following recurring units:
- ##STR5## wherein the mole ratio of dicarboxylic acid moieties in I:II is about 65:35 to 95:5, wherein R and R.sub.2 are aliphatic hydrocarbyl radicals of 2 to 14 carbon atoms, and wherein about 10 to about 60 percent by weight of the filled composition comprises a filler selected from the group consisting of glass fibers, glass beads, or graphite fibers, or mixtures of the same and wherein the filled copolymer has a heat deflection temperature in excess of about 245.degree. C.
A process for preparing a polyamide composition having a heat deflection temperature of at least about 245.degree. C., said process comprising compounding about 90 to about 40 parts by weight of a polyamide with about 10 to about 60 parts by weight of a filler, said polyamide comprising the following recurring units:
- ##STR6## wherein the mole ratio of the dicarboxylic acid moieties in the A:B:C units is about 65-90:25-0:35-5 with the proviso that the mole ratio of the dicarboxylic acid moieties in the B:C units is less than 3:1, and wherein R, R.sub.1, and R.sub.2 are, independently, divalent aliphatic hydrocarbyl radicals of 2 to 14 carbon atoms, and wherein said filler is selected from the group consisting of glass fibers, glass beads, or graphite fibers or mixtures of the same.
A crystalline injection moldable polyamide copolymer having a heat deflection temperature of at least about 245.degree. C. when molded and filled with glass fibers, glass beads or graphite fibers comprising the following recurring units:
- ##STR7## wherein the mole ratio of A:B:C units is about 65-90:25-5:30-5.
Dependencies are inferred from the claim text.