Mitsui Petrochemical Industries, Ltd.

Kojiro Kan

Toru Tomoshige

Kazuyuki Yamasaki

Kimio Yamamoto

Masanobu Watanabe

Yoshio Nakayama

Toshimasa Takata

Akio Yamamoto

Kaoru Tominaga

Isao Kaneko

Katsumi Noritomi

Hideya Aoki

A 4-methyl-1-pentene polymer composition is prepared by melt mixing (A) a 4-methyl-1-pentene polymer, (B) a 1-butene polymer, (C) a propylene polymer, and (D) a triblock copolymer of polystyrene/ethylene-butylene copolymer/polystyrene and/or a triblock copolymer of polystyrene/ethylene-propylene copolymer/polystyrene. The composition has improved gas permeability, flexibility, and mechanical properties and is formed into a film which is heat sealable.

4-Methyl-1-pentene polymer compositions

A modified .alpha.-olefin polymer whose side chain has tertiary carbon, obtained by melt-reacting 100 parts by weight of (A) an .alpha.-olefin polymer whose side chain has tertiary carbon with (B) 0.05 to 10 parts by weight of metal methacrylate or metal acrylate of the formula (1), ##STR1## wherein R is a hydrogen atom or a methyl group, M is a metal cation, X is an anion, m is an integer of at least 2, and n is an integer of at least 2, with a proviso of m.gtoreq.n; and a stretched film thereof.

Modified .alpha.-olefin polymer having tertiary carbon in side chain,

Imide prepolymers comprising unsaturated bisimides, diamines, and tribromophenylmaleimide in cured state show improved heat resistance, especially soldering heat resistance and flame retardance as well as mechanical properties and are suitable as laminates.

Imide prepolymer from bisimide, diamine and tribromophenylmaleimide

A membrane filter material formed from a solvent resistant bimaleimide polymer which is formed by polymerizing a bismaleimide compound with a perhydrodiaza-type heterocyclic compound and has a main structural skeleton represented by the following formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 represents a lower carbon chain which is linear or contains a methyl group or ethyl group on the side chain, R.sub.5 represents a divalent group containing an aromatic ring, Y is &gt;R&lt; or &gt;N--R--N&lt; in which R is a lower carbon chain, and m is 0 or 1. This bismaleimide polymer can be a membrane filter material having an excellent organic solvent resistance. When this polymer is formed into a hollow fiber or plain film, a high separating and filtering capacity and an excellent organic resistance can be attained. A membrane filter material having an enhanced organic solvent resistance is provided by preparing the bismaleimide polymer by reacting the bismaleimide compound and perhydrodiaza-type heterocyclic compound in a halogen-containing organic solvent in the present of a small amount of a phenol.

Membrane filter material having excellent organic solvent resistance,

Imide prepolymer compositions containing an unsaturated component (A) and diamine component (B) at the (A)/(B) molar ratio of 0.9-1.5 and 0.01-5.0% by weight, based on the sum of said components (A) and (B), of at least one radical polymerization inhibitors, and preferably further 0.01-5.0% by weight, based on the sum of said components (A) and (B), of at least one compound selected from the group of carboxylic acid and carboxylic acid anhydride. The imide prepolymer compositions of the present invention which contain the above-defined components in specific proportions are tough and excellent in adhesive strength to glass cloths and metals and in heat resistance.

Imide type prepolymer composition comprising unsaturated bis imide,

A membrane filter material formed from a solvent resistant bismaleimide polymer which is formed by polymerizing a bismaleimide compound with a perhydrodiaza-type heterocyclic compound and has a main structural skeleton represented by the following formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 represents a lower carbon chain which is linear or contains a methyl group or ethyl group on the side chain, R.sub.5 represents a divalent group containing an aromatic ring, Y is &gt;R&lt; or &gt;N--R--N&lt; in which R is a lower carbon chain, and m is 0 or 1. This bismaleimide polymer can be a membrane filter material having an excellent organic solvent resistance. When this polymer is formed into a hollow fiber or plain film, a high separating and filtering capacity and an excellent organic resistance can be attained. A membrane filter material having an enhanced organic solvent resistance is provided by preparing the bismaleimide polymer by reacting the bismaleimide compound and perhydrodiaza-type heterocyclic compound in a halogen-containing organic solvent in the presence of a small amount of a phenol.

There is provided the process for producing an imide-based prepolymer having high solvent solubility by reacting an unsaturated bisimide of formula (I): ##STR1## wherein D is a divalent group having a carbon-to-carbon double bond, and A is a divalent group having at least two carbon atoms, with a diamine in the presence of a radical scavenger.

Imide-based prepolymer and varnish prepolymers with radical scavenger

A polyaminobisimide resin composed of an unsaturated bisimide and a diamine which employs 1,3-bis and/or 1,4-bis(2-p-anilinopropylidene) benzene as a diamine component, when cured and used in a laminate, exhibit improved ply separation strength and water absorption.

Polyaminobisimide resin from bis(anilino propylene) benzene

A semiconductor encapsulating material is obtained from a polyimide resin composition comprising (A) a polyaminobismaleimide resin, (B) a silicone monomer and/or oligomer having a hydroxyl or alkoxyl group bonded to a silicon atom and mixtures thereof, and (C) an inorganic filler wherein the weight ratio of polyaminobismaleimide resin (A) to silicone component (B) ranges from 99.5/0.5 to 70/30, and the weight ratio of polyaminobismaleimide resin (A) to inorganic filler (C) ranges from 100/50 to 100/1000.

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Ichihara, Japan

Kojiro Kan