Highly rigid polyamide composition
AssigneeToray Industries, Inc.
InventorToshio Muraki
Life of this patent
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Abstract
A highly rigid poly-.epsilon.-caproamide composition containing about 50 to 5000 ppm of barium combined with the poly-.epsilon.-caproamide, and having a .gamma.-type crystal ratio of about 0.3 to 0.7 is disclosed. The polyamide has improved rigidity without loss of other advantageous mechanical properties of poly-.epsilon.-caprolactam. By addition of an aluminum compound, the rigidity of the composition can be further improved. A bisamide compound may be added to provide excellent mold release without harming the mechanical properties of the composition.
Claims14
A highly rigid polyamide which comprises poly-.epsilon.-caprolactam containing about 50 to 5000 ppm of combined barium, said barium combined with the poly-.epsilon.-caprolactam, and having a .gamma.-type crystal ratio of about 0.3 to 0.7 in the crystalline phase.
A highly rigid polyamide which comprises poly-.epsilon.-caprolactam containing about 50 to 5000 ppm of barium and about 2 to 200 ppm of aluminum, at least said barium being combined with the poly-.epsilon.-caprolactam, and having a .gamma.-type crystal ratio of about 0.4 to 0.9 in the crystalline phase.
A highly rigid polyamide molding composition which comprises 100 parts by weight of poly-.epsilon.-caprolactam containing about 50 to 5000 ppm of barium, said barium being combined with the poly-.epsilon.-caprolactam, and having a .gamma.-type crystal ratio of about 0.3 to 0.7 in the crystalline phase and about 0.005 to 1 part by weight of a bisamide compound represented by the following general formula ##STR2## wherein R.sub.1 represents a divalent hydrocarbon group having 1 to 10 carbon atoms, R.sub.2 and R.sub.3 represent monovalent hydrocarbon groups having 10 to 30 carbon atoms, and R.sub.4 and R.sub.5 represent hydrogen or a monovalent hydrocarbon group having 1 to 4 carbon atoms.
A highly rigid polyamide molding composition which comprises 100 parts by weight of poly-.epsilon.-caprolactam containing about 50 to 5000 ppm of barium and about 2 to 200 ppm of aluminum, at least said barium being combined with the poly-.epsilon.-caprolactam, and having a .gamma.-type crystal ratio of about 0.4 to 0.9 in the crystalline phase and about 0.005 to 1 part by weight of a bisamide compound represented by the following general formula ##STR3## wherein R.sub.1 represents a divalent hydrocarbon group having 1 to 10 carbon atoms, R.sub.2 and R.sub.3 represent monovalent hydrocarbon groups having 10 to 30 carbon atoms, and R.sub.4 and R.sub.5 represent hydrogen or monovalent hydrocarbon groups having 1 to 4 carbon atoms.
A process for producing a highly rigid polyamide which comprises treating poly-.epsilon.-caprolactam with an aqueous solution containing barium ions, said solution having a normality of about 0.01 to 1, heating the treated poly-.epsilon.-caprolactam to the molten state, and solidifying the same.
A process for producing a highly rigid polyamide which comprises melt-polymerizing .epsilon.-caprolactam to poly-.epsilon.-caprolactam in the presence of a barium compound selected from the group consisting of barium-.epsilon.-caprolate and Ba(OH).sub.2 wherein a poly-.epsilon.-caprolactam having .gamma.-type crystal ratio of about 0.3 to 0.7 in the crystalline phase is obtained.
A process for producing a highly rigid polyamide which comprises melt-blending poly-.epsilon.-caprolactam containing about 50 to 5000 ppm of barium, said barium being combined with the poly-.epsilon.-carpolactam, and having a .gamma.-type crystal ratio of about 0.3 to 0.7 with an aluminum salt of an aliphatic carboxylic acid having about 2 to 20 carbon atoms.
A process for producing a highly rigid polyamide which comprises melt-polymerizing .epsilon.-caprolactam to poly-.epsilon.-caprolactam in the presence of a barium compound selected from the group consisting of Ba(OH).sub.2 and barium salts of an aliphatic carboxylic acid having about 2 to 20 carbon atoms and an aluminum compound selected from the group consisting of aluminum salts of an aliphatic carboxylic acid having about 2 to 20 carbon atoms, aluminum borate and aluminum hydroxide.
The process for producing a highly rigid polyamide which comprises melt-polymerizing .epsilon.-caprolactam to poly-.epsilon.-caprolactam in the presence of a barium compound selected from the group consisting of barium-.epsilon.-caprolate and Ba(OH).sub.2 so as to produce a poly-.epsilon.-caprolactam containing about 50 to 5,000 ppm of combined barium.
The process for producing a highly rigid polyamide which comprises melt-polymerizing .epsilon.-caprolactam to poly-.epsilon.-caprolactam in the presence of a barium compound selected from the group consisting of Ba(OH).sub.2 and barium salts of an aliphatic carboxylic acid having about 2 to 20 carbon atoms and an aluminum compound selected from the group consisting of aluminum salts of an aliphatic carboxylic acid having 2 to 20 carbon atoms, aluminum borate and aluminum hydroxide so that the resulting poly-.epsilon.-carprolactam contains about 50 to 5,000 ppm of barium.
Dependencies are inferred from the claim text.