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US 6,150,438 AGranted
Composite resin composition
AssigneeMitsui Chemicals, Inc.
InventorsNobuo Shiraishi, Masanobu Ajioka
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AssigneeMitsui Chemicals, Inc.
InventorsNobuo Shiraishi, Masanobu Ajioka
Estimating the term…
The invention provides a composite resin composition comprising aliphatic polyester resin (component A) having aliphatic hydroxycarboxylic acid units, one or more biomass material (component B) selected from the group consisting of cellulose, lignocellulose and starch and unsaturated carboxylic acid or a derivative thereof (component C), wherein the composite resin composition comprises a component obtained by covalently bonding a portion or the whole of component A and component B through component C. On processing into various formed items, the composite resin composition of the invention exhibits excellent tensile strength and other physical properties and processability and simultaneously has good biodegradability, and enable biomass materials of low added value to apply to high added value uses in a large amount.
A preparation process of a composite resin composition comprising obtaining modified aliphatic polyester (component D) having aliphatic hydroxycarboxylic acid units by heating and reacting 100 parts by weight of aliphatic polyester resin (component A) having aliphatic hydroxycarboxylic acid units and 1-30 parts by weight of unsaturated carboxylic acid or a derivative thereof (component C) in the presence or absence of a solvent in the presence of a radical generator, and successively heating and kneading a mixture of 5-95% by weight of a mixture (component E) of 0-95 % by weight of component A and 100-5 % by weight of component D, and 95-5 % by weight of one or more biomass materials (component B) selected from the group consisting of cellulose and lignocellulose.
A composite resin composition comprising a mixture (component E) of 0-95 % by weight of aliphatic polyester resin (component A) having aliphatic hydroxycarboxylic acid units and 100-5 % by weight of modified aliphatic polyester resin (component D) having aliphatic hydroxycarboxylic acid units which is obtained by reacting 100 parts by weight of component A with 1-30 parts by weight of unsaturated carboxylic acid or a derivative thereof (component C), and one or more biomass materials (component B) selected from the group consisting of cellulose and lignocellulose, wherein said composite resin composition comprises a component obtained by covalently bonding a portion or the whole of component A and component B through component C and component B is 5-95 % by weight of component B and component D or component E.
The composite resin composition according to claimed 5, wherein the unsaturated carboxylic acid or a derivative thereof (component C) is maleic acid or maleic anhydride.
Dependencies are inferred from the claim text.