Abstract: A saponified ethylene-vinyl acetate resin, containing from 0.1 to 3000 ppm of a compound having a molecular weight of at most 1000 and having at least one conjugated double bond, an alkoxy group content of from 0.0005 to 1 mol %, an ethylene content of from 5 to 60 mol %, and a degree of saponification of at least 85 mol % has good melt extrusion stability, drawdown resistance, interlayer adhesion and gas barrier properties, and products made therefrom have good surface smoothness. The saponified ethylene-vinyl acetate resin may be produced by polymerizing a mixture of ethylene and vinyl acetate in the presence of a polymerization initiator having an alkoxy group, thereby producing an ethylene-vinyl acetate copolymer, adding a compound having a molecular weight of at most 1000 and at least one conjugated double bond to the ethylene-vinyl acetate copolymer, then saponifying the ethylene-vinyl acetate copolymer, thereby forming a saponified ethylene-vinyl acetate copolymer.

Abstract: A saponified ethylene-vinyl acetate resin, containing from 0.1 to 3000 ppm of a compound having a molecular weight of at most 1000 and having at least one conjugated double bond, an alkoxy group content of from 0.0005 to 1 mol %, an ethylene content of from 5 to 60 mol %, and a degree of saponification of at least 85 mol % has good melt extrusion stability, drawdown resistance, interlayer adhesion and gas barrier properties, and products made therefrom have good surface smoothness. The saponified ethylene-vinyl acetate resin may be produced by polymerizing a mixture of ethylene and vinyl acetate in the presence of a polymerization initiator having an alkoxy group, thereby producing an ethylene-vinyl acetate copolymer, adding a compound having a molecular weight of at most 1000 and at least one conjugated double bond to the ethylene-vinyl acetate copolymer, then saponifying the ethylene-vinyl acetate copolymer, thereby forming a saponified ethylene-vinyl acetate copolymer.

Abstract: A resin composition comprises a copolymer (A) comprising ethylene as a major component produced with a single-site catalyst, and an ethylene-vinyl alcohol copolymer (B) having an ethylene content of 20-60 mol. % and a degree of hydrolysis of 95% or above, the resin composition satisfying the equation (1): 1/99≦{weight of (A)}/{weight of (B)}≦<99/1  (1) A preferred resin composition comprises a copolymer (A) which has a density of 0.90-0.94 g/cm3 and the resin composition further comprises a carboxylic acid-modified polyolefin (C) and satisfies the equations (2) and (3): 60/40≦{weight of (A)}/{(weight of (B)}≦: 99/1  (2) 0.1/99.9≦X≦: 20/80  (3) wherein X={weight of (C)}/{total weight of (A) and (B)}. Another preferred resin composition comprises a copolymer (A) which has a density of 0.85-0.

Abstract: The present invention provides a method for producing an ethylene-vinyl acetate copolymer (EVA) containing 5 mol % to 60 mol % of ethylene, by copolymerizing ethylene and vinyl acetate with a polymerization initiator, in which an aliphatic alcohol having not more than four carbon atoms is used as the polymerization solvent, the contents of acetaldehyde and a saturated acetic ester with respect to vinyl acetate are not more than 200 ppm, and 10 ppm to 1500 ppm, respectively, and polymerization is carried out at a temperature of 30° C. to 150° C. EVA obtained by the foregoing method may be saponified to obtain a saponified ethylene-vinyl acetate copolymer (EVOH). According to the present invention, at least one of (i) improved melt-extrusion stability, (ii) improved melt-moldability, (iii) reduced discoloration, and (iv) reduced gelation is achieved.

Abstract: A resin composition comprises a copolymer (A) comprising ethylene as a major component produced with a single-site catalyst, and an ethylene-vinyl alcohol copolymer (B) having an ethylene content of 20-60 mol.

Abstract: The present invention provides a method for producing an ethylene-vinyl acetate copolymer (EVA) containing 5 mol% to 60 mol% of ethylene, by copolymerizing ethylene and vinyl acetate with a polymerization initiator, in which an aliphatic alcohol having not more than four carbon atoms is used as the polymerization solvent, the contents of acetaldehyde and a saturated acetic ester with respect to vinyl acetate are not more than 200 ppm, and 10 ppm to 1500 ppm, respectively, and polymerization is carried out at a temperature of 30° C. to 150° C. EVA obtained by the foregoing method may be saponified to obtain a saponified ethylene-vinyl acetate copolymer (EVOH). According to the present invention, at least one of (i) improved melt-extrusion stability, (ii) improved melt-moldability, (iii) reduced discoloration, and (iv) reduced gelation is achieved.

Abstract: A resin composition comprises a copolymer (A) comprising ethylene as a major component produced with a single-site catalyst, and an ethylene-vinyl alcohol copolymer (B) having an ethylene content of 20-60 mol. % and a degree of hydrolysis of 95% or above, the resin composition satisfying the equation (1): 1/99≦{weight of (A)}/{weight of (B)}≦99/1  (1) A preferred resin composition comprises a copolymer (A) which has a density of 0.90-0.94 g/cm3 and the resin composition further comprises a carboxylic acid-modified polyolefin (C) and satisfies the equations (2) and (3): 60/40≦{weight of (A)}/{(weight of (B)}≦:99/1  (2) 0.1/99.9≦X≦:20/80  (3) wherein X={weight of (C)}/{total weight of (A) and (B)}. Another preferred resin composition comprises a copolymer (A) which has a density of 0.85-0.

Abstract: A gas barrier material having an oxygen permeability of not higher than 30 ml.multidot.20 .mu.m/m.sup.2 .multidot.day.multidot.atm measured at 20.degree. C., 100% RH, which comprises a polymer containing not less than 30 mol % of repeating units of formula (1): ##STR1## wherein R.sup.1 is a C.sub.1-2 alkyl group, and R.sup.2 is hydrogen or a C.sub.1-3 alkyl group.This gas barrier material exhibits very good gas barrier properties under conditions of high humidity, and it possesses superior clarity and melt moldability.

Abstract: A collapsible tube is obtained by heat bonding a head to a polyolefin sleeve, the head comprising a composition which comprises a polyolefin resin (A), a saponified product of ethylene-vinyl acetate copolymer (B) having a melting point of at least 135.degree. C., and a saponified product ethylene-vinyl acetate. copolymer (C) having a melting point of not more than 130.degree. C.

Abstract: A blow molded multilayered container comprises a layer of a polyalcohol obtained by reduction of a polyketone comprising carbon monoxide-ethylene copolymer and a layer of a thermoplastic resin other than polyalcohol, said polyalcohol having an intrinsic viscosity of 0.3 to 3.0 dl/g, a melting point of 110.degree. to 160.degree. C., a density of 1.12 to 1.21 g/cm.sup.3 and a tetrahydrofuran ring content of not more than 10 mole %.

Abstract: A film having a dynamic modulus of elasticity at 75.degree. C. of 10.sup.8 to 10.sup.11 dyne/cm.sup.2 and an oxygen permeability at 20.degree. C., 75% RH of not more than 5.times.10.sup.12 cc.cm/cm.sup.2.sec.cmHg comprises a polyalcohol obtained by reducing a polyketone comprising a carbon monoxide-ethylene alternate copolymer, the polyalcohol having an intrinsic viscosity of 0.3 to 3.0 dl/g and a melting point of 110.degree. to 180.degree. C.; and a laminated film comprising the same. These films have excellent high-speed bag formability, heat-pack sealability, film formability, film appearance, adhesiveness and gas barrier properties.

Abstract: The present invention provides a process of producing a vinyl acetate polymer by homopolymerization of a vinyl acetate monomer or copolymerization of a vinyl acetate monomer and another copolymerizable comonomer, wherein a polymerization initiator is an organic peroxide having a half life at 60.degree. C. of 10 to 110 minutes, and a polymerization liquid contains at least one carboxylic acid or its salt, said carboxylic acid being selected from the group consisting of a hydroxycarboxylic acid and a polycarboxylic acid.