Kuraray Co., Ltd.

Idemitsu Petrochemical Co., Ltd.

Keishiro Igi

Masao Ishii

Yoshifumi Murata

Takayuki Okamura

Masao Uetsuki

Shunro Taniguchi

Hiroshi Narukawa

Shinichi Yokota

Kazuto Hashimoto

Hisashi Ogawara

Kenji Shirano

Satoshi Bando

Hideki Endo

Shuji Kawai

Takeshi Matsumoto

Haruo Nakayasu

Hideo Takahashi

Kenji Tanaka

Osamu Kusudo

Yoshito Hamamoto

Ishii Masao

A polycarbonate resin composition which comprises

Polycarbonate resin composition

A copolyester film is disclosed which comprises a copolyester in which the dicarboxylic acid component comprises 100 to 85 mole percent of terephthalic acid and the diol component comprises 65 to 97 mole percent of 1,4-butanediol and 3 to 35 mole percent of a polyethylene glycol with a molecular weight of 106 to 550. The copolyester has a reduced viscosity in the range of 0.8 to 1.4 dl/g as measured at a concentration of 0.5 g/dl in a 1:1 (by weight) solvent mixture of phenol and tetrachloroethane at 30.degree. C. The copolyester has a main endothermic peak with a peak maximum temperature of 160.degree. C. to 200.degree. C. and at least one subsidiary endothermic peak with a peak maximum temperature of 30.degree. C. to 80.degree. C. in differential scanning calorimetry with the ratio (R) of the area occupying not less than 40.degree. C. in the subsidiary endothermic peak, the main endothermic peak area being within the range of 3 percent to 20 percent. A hot melt adhesive comprising the copolyester film and a method for producing the copolyester film are also disclosed. The hot melt adhesive has a high initial modulus of elasticity at high temperature (30.degree.-50.degree. C.) and features improved processability or workability while retaining the required properties of a hot melt adhesive.

Copolyester film and a method for production thereof

A copolyester film comprising: (a) a copolyester which comprises, as a dicarboxylic acid component, 80 to 97 mole percent of terephthalic acid and 3 to 20 mole percent of isophthalic acid and, as a diol component, 60 to 85 mole percent of 1,4-butanediol and 15 to 40 mole percent of diethylene glycol, and said copolyester having a reduced viscosity in the range of 0.8 to 1.4 dl/g and a melting point in the range of 160.degree. to 200.degree. C.; and said film having (b) a heat of crystal fusion in the range of 5 to 10 cal/g, (c) a haze value in the range of 5 to 35 percent, and (d) an initial Young's modulus in the range of 3.times.10.sup.3 kg/cm.sup.2 to 30.times.10.sup.3 kg/cm.sup.2. A hot melt adhesive comprising said film is also provided. This hot melt adhesive has excellent high speed bonding characteristics, durability and high bond strength with respect to substrates.

Copolyester film and a hot melt adhesive comprising said film

Polycarbonate resin compositions are disclosed, comprising: (1) (A) a polycarbonate resin and (B) polyesterether elastomer, said elastomer composing of a bifunctional carboxylic acid component and a glycol component comprising polyalkylene glycol and ethylene glycol, or (2) the components (A) and (B), and (C) a rubber-like elastomer, or (3) the components (A) and (B), and (D) a polyester resin, or (4) the components (A), (B), (C) and (D). These compositions are excellent in solvent resistance and so forth, and further possess excellent physical and thermal properties characteristic of a polycarbonate resin. Thus the compositions are useful for use in production of industrial and electrical articles, such as a car bumper in the field of car industry.

An aluminum atom- and monocarboxylic acid residue-containing polyester is provided. Using the polyester as an adhesive or a base, laminates and laminated hollow vessels which comprise, as the constituent elements, the polyester and an ethylene-vinyl alcohol copolymer can be produced. The laminates and laminated hollow vessels are suitable for use as packaging materials or containers for food and drink.

Polyester, adhesives comprising the same, and laminates and laminated

Mixing (a) a carboxylic acid, (b) a divalent or trivalent metal oxide or hydroxide and (c) a foundry molding sand in the presence of an aqueous solution of (d) a carboxyl-group-containing polymer or (e) water followed by shaping and curing can provide sand molds having sufficiently high green strength without contamination of the working environment. The molding sand composition has excellent processability, which means filling of shapes or molds with the sand can be done with ease. The sand molds manufactured in this way can be disintegrated by a simple procedure. Therefore the molding sand can be used over and over again and does not cause environmental pollution due to disposal of the molding sand.

Method of manufacturing foundry sand molds

Laminated structures consisting of two or more adherend members selected from a variety of materials such as metals and plastics bonded together with adhesive layers of hot melt adhesive of a polyester made from terephthalic acid or a dicarboxylic acid mixture containing at least 85 mole % of terephthalic acid, 0.65 to 0.97 mole per mole of terephthalic acid or dicarboxylic acid mixture of 1,4-butanediol or a polymethylene glycol mixture containing at least 80 mole % of 1,4-butanediol and 0.03 to 0.35 mole per mole of said terephthalic acid or dicarboxylic acid mixture of polyethylene glycol having a molecular weight of 150 to 550, the total amount of the diol constituents being one mole per mole of said terephthalic acid or dicarboxylic acid mixture, said polyester in the laminated structures having a crystallinity of not less than 25% and being substantially free from spherulites, can retain the high bonding strength of the adhesive for a prolonged period of time and at the same time are excellent in resistance to heat and hot water.

Laminates

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Kurashiki, Japan

Keishiro Igi