摘要:
Disclosed herein is a heat-shrinkable laminate film excellent in gas-barrier property and oil-resistance and heat-sealing resistance, comprisinga core layer of a gas-barrier resin which is a copolymer of vinylidene chloride or a copolymer of ethylene and vinyl alcohol, the outer layer (A) of a resin which is a copolymer (I) of ethylene and alpha-olefine having specific gravity of 0.900 to 0.950 and of a crystal melting point of 110.degree. to 130.degree. C. or a mixture of more than 20% by weight of the copolymer (I) and less than 80% by weight of a copolymer (II) of ethylene and vinyl acetate having crystal melting point of 80.degree. to 103.degree. C., the other outer layers (B) of a resin which is a cross-linked material formed from a polymer selected from the group consisting of the copolymer (I), the copolymer (II) and mixture of the copolymer (I) and the copolymer (II) by exposing the polymer to an ionizing irradiation, and two adhesive layers disposed between the core layer and the outer layers (A) and (B).
摘要:
Disclosed herein is a heat-shrinkable laminate film comprising outer layers of a polyolefin, a gas-barrier layer of a copolymer of vinylidene chloride, at least one intermediate layer of an ionomer and adhesive layers disposed between any of the above layers, the total thickness of the intermediate layer(s) of an ionomer being 5 to 20% of the total thickness of the heat-shrinkable laminate film.The heat-shrinkable laminate film is particularly useful in packaging foodstuffs.
摘要:
Disclosed herein is a heat-shrinkable laminate tubular film comprising a gas-barrier layer of a copolymer of vinylidene chloride, outer layers of a polyolefin, at least one intermediate layer of a polyamide or a thermoplastic polyester both of which show a crystal melting point of not more than 240.degree. C. and have a specified thickness, and adhesive layers disposed between any of the above layers.
摘要:
Disclosed herein is a heat-shrinkable multi-layered laminate film comprising a core layer made of a saponified copolymer of ethylene and vinyl acetate, two outer layers made of a mixture of a copolymer of ethylene and vinyl acetate having a crystal melting point of 85.degree. to 103.degree. C. and a copolymer of propylene and ethylene having a crystal melting point of 126.degree. to 155.degree. C. or a linear low-density polyethylene having a crystal melting point of 110.degree. to 125.degree. C. and two adhesive layers disposed between the core layer and the two outer layers, the multi-layered laminate film being excellent in gas-barrier property, oil resistance and peel-resistance of the sealed parts in the heat shrinkage and suitable for heat-shrinking packaging of foodstuffs, particularly for vacuum heat-packaging of foodstuffs.
摘要:
Disclosed herein are a heat-resistant and oil-resistant laminate film comprising gas-barrier resin layer(s), thermoplastic resin layer(s) different from a gas-barrier resin and adhesive layer(s) disposed between the gas-barrier resin layer and the thermoplastic resin layer, produced by co-extruding a gas-barrier resin, a thermoplastic resin and an adhesive composition and irradiating the co-extruded laminate, the total number of the layers of the laminate film being not less than 3, and the adhesive layer comprising a cross-linked polymer and the adhesive composition consisting essentially of 100 parts by weight of a melt-extrudable adhesive resin and 0.1 to 50 parts by weight of a radiation-sensitive compound, and a process for producing the heat-resistant and oil-resistant laminate film.
摘要:
Disclosed herein is a coextruded, biaxially stretched and laminated heat-shrinkable tubular film, comprising:a gas-barrier layer of a copolymer of vinylidene chloride having a thickness, which is not more than 30% of the total thickness of the coextruded, biaxially stretched and laminated heat-shrinkable tubular film, of not less than 6 .mu.m, outer layers of a polyolefin, at least one intermediate layer of a polyamide or a thermoplastic polyester, both of which show a crystal melting point of not more than 240.degree. C., said intermediate layer having a thickness of 5 to 40% of the total thickness of the coextruded, biaxially stretched and laminated heat-shrinkable tubular film, and adhesive layers disposed between all or certain polymer layers, andthe total thickness of the coextruded, biaxially stretched and laminated heat-shrinkable tubular film being in the range of 25 to 110 micrometers,the coextruded, biaxially stretched and laminated heat-shrinkable tubular film being produced by laminating and co-extruding the copolymer of vinylidene chloride, the polyolefin, polyamide or the thermoplastic polyester and the adhesive material, cooling, heating and stretching the resultant laminated tubular film.
摘要:
A group III nitride compound semiconductor light-emitting device according to the present invention includes: an active layer (105) comprised of a group III nitride compound semiconductor; a current blocking layer (108) which is formed on the active layer (105) and has a striped aperture (108a); a superlattice layer (p-type layer 109) which buries the aperture (108a) and is comprised of a group III nitride compound semiconductor including Al; and a cladding layer (110) which is formed on the superlattice layer and is comprised of a group III nitride compound semiconductor including Al. When an average Al composition ratio of the superlattice layer is represented as x1 and an average Al composition ratio of the cladding layer (110) is represented as x2, it is represented as x1
摘要:
A group III nitride compound semiconductor light-emitting device according to the present invention includes: an active layer (105) comprised of a group III nitride compound semiconductor; a current blocking layer (108) which is formed on the active layer (105) and has a striped aperture (108a); a superlattice layer (p-type layer 109) which buries the aperture (108a) and is comprised of a group III nitride compound semiconductor including Al; and a cladding layer (110) which is formed on the superlattice layer and is comprised of a group III nitride compound semiconductor including Al. When an average Al composition ratio of the superlattice layer is represented as x1 and an average Al composition ratio of the cladding layer (110) is represented as x2, it is represented as x1
摘要:
A graft copolymer is obtained by graft-polymerizing a vinyl or vinylidene monomer onto a rubber trunk polymer which comprises a polyalkylene oxide monomer comprising 4 to 500 alkylene oxide groups together with an ethylenic unsaturation, and a conjugated diene and/or an alkyl acrylate. This graft copolymer alone or in a mixture thereof with another thermoplastic resin, because of the presence of the polyalkylene oxide monomer unit incorporated in the rubber trunk polymer, provides a resin composition possessing excellent antistatic property, which, practically, is not lowered by washing.
摘要:
A vinyl chloride resin composition having surface smoothness comprises:(1) 100 parts of vinyl chloride polymer; and(2) 0.1 to 30 parts of a polymer processing aid comprising:(A) 10 to 100 parts of a copolymer comprising 20 to 99% of an alkyl methacrylate, 1 to 70% of a dialkyl itaconate, and 0 to 60% of a monomer copolymerizable therewith; and(B) 0 to 90 parts of a copolymer comprising 80 to 100% of an alkyl methacrylate, and 0 to 20% of a monomer copolymerizable therewith,the sum of the quantities of the copolymers (A) and (B) producing 100 parts of the polymer processing aid, all quantities expressed in parts and percentages being by weight.This vinyl chloride resin composition comprising a novel polymer processing aid not only shows an increased gelation rate, yields less ungelled particles and possesses excellent processability such as an increased elongation at a high temperature, but particularly affords a formed product of notably improved surface smoothness.