Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
1998-07-22
2001-01-30
Cain, Edward J. (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
active
06180719
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a heat-fusion composition for use in a multi-layer molding (referred to a heat-fusion composition hereinafter) and a multi-layer molded body obtained by a double injection molding, an insert molding, a multi-layer extrusion or multi-layer blow molding of a heat-fusion composition and a hard resin. In more detail, the present invention relates to a multi-layer molded body containing a layer comprising a heat-fusion composition composed of a block copolymer having epoxy groups and a thermoplastic elastomer.
BACKGROUND ART
Hard resins and thermoplastic elastomers have been molded into a multi-layers in the conventional art. This multi-layer molding makes use of the function of elastomers such as soft feeling and slip preventive property as a surface skin material, along with integrating the elastomer into a seal material and packing material to obtain a molded body with a good water-proof property. Integrated molding can also save the cost for adhering the hard resin with the thermoplastic resin. Many molded bodies and heat-fusion compositions have been recently proposed through the attempt to improve the fusion property of the hard resins and thermoplastic elastomers.
Japanese Examined Patent Publication No. 4-2412 proposes a multi-layer injection molded body comprising (a) an elastomer of a hydrogenated block copolymer obtained by hydrogenating a block copolymer comprising a polymer block A mainly composed of at least two vinyl aromatic compounds and a polymer block B mainly composed of at least one conjugated diene compound and (b) a resin selected from a polyolefin resin, polystyrene resin and ABS resin. However, the elastomer of hydrogenated block copolymers used in the invention cited herein has no functional groups to enhance the adhesive property, imposing a limitation in the heat-fusion property.
Japanese Unexamined Patent Publications No. 1-139240, No. 1-139241, No. 3-100045, No. 6-65467 and No. 6-107898 propose a method for producing a composite molded body comprising a thermoplastic elastomer composition, in which a styrene-based thermoplastic elastomer having no functional groups is combined with other thermoplastic elastomers, and a hard resin selected from polycarbonate, nylon 11, nylon 12, ABS resin and PMMA resin.
However, the styrene-based thermoplastic elastomers used in the invention cited herein has no functional groups to enhance the adhesive property, rendering the compositions poor adhesive property.
Japanese Unexamined Patent Publication No. 8-59954 proposes a composition in which (a) a hydrogenated block copolymer obtained by hydrogenating a block copolymer comprising a polymer block A mainly composed of at least. one vinyl aromatic compound and a polymer block B mainly composed of at least one conjugated diene compound, and/or a modified hydrogenated elastomer in which the hydrogenated block copolymer is bound with a molecular unit containing a carboxylic acid group or its derivative group, (b) a polystyrene based resin and/or a polyphenylene based polymer and (c) a thermoplastic elastomer comprising an ethylene—unsaturated carboxylic acid ester copolymer are laminated on a resin mainly composed of the resin (b). Although the heat-fusion property of the modified hydrogenated block copolymer as used herein has been improved by virtue of functional groups since the resin is modified with a carboxylic acid group or its derivative group, the resin is only able to fuse with so-called modified PPO resins. Accordingly, developments of a heat-fusion resin being able to fuse with an wider range of resins are desired.
The object of the present invention is to provide a heat-fusion composition that contains a block copolymer having epoxy groups and has a heat-fusion property with a hard resin, and a multi-layer molded body in which the layer comprising the heat-fusion composition and a layer comprising various kind of hard resins are strongly heat-fused.
DISCLOSURE OF INVENTION
For the purpose of solving the problems as hitherto described, the inventors of the present invention have extensively and precisely investigated the epoxydized block copolymer compositions having epoxy groups as functional group, finding that an excellent multi-layer molded body can be obtained by taking advantage of heat-fusion properties of a composition containing a block copolymer having epoxy groups, especially a composition comprising a block copolymer having epoxy groups and a specified thermoplastic elastomer, thereby completing the present invention.
The first embodiment according to the present invention provides a heat-fusion composition containing a block copolymer having epoxy groups and a heat-fusion composition comprising a block copolymer having epoxy groups and a thermoplastic elastomer.
The present invention also provides a heat-fusion composition comprising (a) a block copolymer having epoxy groups, for example an epoxydized block copolymer obtained by epoxydizing a block copolymer comprising a polymer block mainly composed of a vinyl aromatic hydrocarbon compound and a polymer block mainly composed of a conjugated diene compound, or its hydrogenated product and (b) at least one kind of thermoplastic elastomer selected from a styrene elastomer, polyurethane elastomer, polyester elastomer, polyamide elastomer, polyolefin elastomer and polyvinyl chloride elastomer, wherein the blending ratio of the component (a) is in the range of 20 to 80% by weight and the blending ratio of the component (b) is in the range of 20 to 80% by weight with a combined amount of (a) and (b) of 100%. The present invention also provides a heat-fusion composition containing (d) 0.01 to 25 parts by weight of a polyfunctional compound containing at least two functional groups reactive to the epoxy group in the molecule and/or (e) 0.001 to 2 parts by weight of an accelerating agent for the curing reaction of epoxy groups per 100 parts by weight of the heat-fusion composition. The present invention further provides a heat-fusion composition comprising (c) 10 to 50 parts by weight of a hard resin and (d) 0.01 to 25 parts by weight of a polyfunctional compound containing at least two functional groups reactive to the epoxy group in the molecule and/or (e) 0.001 to 2 parts by weight of an accelerating agent for the curing reaction of epoxy groups per 100 parts by weight of the heat-fusion composition.
The second embodiment according to the present invention provides a multi-layer molded body composed of a layer comprising the heat-fusion composition according to the first embodiment and the other layer, for example a layer comprising at least one kind of resin selected from an ABS resin, impact resistant polystyrene, polycarbonate, polytmethylmethacrylate, polypropylene, saturated polyester resin, polyamide, polyvinyl chloride and polyphenylene oxide resin. The present invention also provides a multi-layer molded body composed of a layer comprising the heat-fusion composition according to the first embodiment and a layer comprising a composition prepared by blending (d) 0.01 to 25 parts by weight of a polyfunctional compound containing at least two functional groups reactive to the epoxy group in a molecule, for example a polyfunctional compound containing at least two different or identical functional groups selected from an amino group, a carboxylic anhydride group, a phenolic hydroxide group, a hydroxyl group and a carboxyl group in a molecule, and/or (e) 0.001 to 2 parts by weight of an accelerating agent for the curing reaction of epoxy groups per 100 parts by weight of the hard resin of the other layer.
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention will now be described in more detail hereinafter. The heat-fusion composition according to the present invention is characterized by containing a block copolymer (a) having epoxy groups. The heat-fusion composition according to the present invention also comprises a block copolymer (a) having epoxy groups and a thermoplastic elastomer. The heat-fusion composition according to the present
Cain Edward J.
Daicel Chemical Industries Ltd
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