JPH0669295U - Synthetic resin leather - Google Patents

Abstract

(57) [Summary] [Objective] To provide a synthetic resin leather having flexibility. [Structure] An intermediate layer 2 made of an ethylene-based random or block copolymer resin composition sheet having a methyl methacrylate content of 18% or more is laminated on the upper surface of a base fabric 1,
On the upper surface of the intermediate layer 2, a mixture of an ethylene / α-olefin copolymer rubber and a polyolefin resin is added with 30
% Of the ethylene-based resin composition is mixed, and the surface layer 3 made of a sheet is laminated, and a texture pattern or a paint 4 is applied as necessary. [Effect] It becomes highly flexible and soft, and can maintain a practical hot adhesive force.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to synthetic resin leather.

[0002]

[Prior art]

 Conventionally, vinyl chloride resin-based leather is often used. However, this vinyl chloride resin-based leather is not preferable due to the problem that the plasticizer volatilizes or migrates. As a solution to this problem, there is known one in which a modified polyolefin intermediate layer and a thermoplastic elastomer surface layer are formed on a base fabric as described in JP-A-63-251233.

[0003]

[Problems to be solved by the device]

 However, this one lacked flexibility and had insufficient peel strength during hot working. The present invention is intended to provide a flexible product having a sufficient peel strength when hot.

[0004]

[Means for Solving the Problems]

 The technical means for achieving the above object is to laminate an intermediate layer made of an ethylene-based random or block copolymer resin composition sheet having a methyl methacrylate content of 20% or more on the upper surface of the base fabric, and to form the intermediate layer. On the upper surface of the above, a surface layer composed of a sheet in which 30% or more of the ethylene resin composition is mixed with a mixture of an ethylene / α-olefin copolymer rubber and a polyolefin resin is laminated.

[0005]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. The base fabric 1 has a well-known form in the technical field of this type, and is made of nylon, vinylon, polyester, polyamide, polyvinyl chloride, polyolefin, preferably polypropylene. Fabrics made of synthetic fibers such as, knitted fabrics, mixed fabrics or non-woven fabrics are used.

The intermediate layer 2 is a sheet made of an ethylene resin composition having a methyl methacrylate (MMA) content of 18% or more, for example, ethylene methyl methacrylate (EMMA), and is formed by copolymerizing the following formula (a): ethylene. System random or block co-polymer resin composition (a) well known in the technical field of this type as CH ₂ ═CH ₂ , CH ₂ ═CR ₁ COOR ₂ <R ₁ is H, CH ₃ and R ₂ is an alkyl group> Preferably, the melting point is 80 ° C. or higher, and if the melting point is 80 ° C. or lower, the peeling force at 60 ° C. (when hot) is insufficient as a leather and the content of methyl methacrylate (MMA) is If it is less than 18%, it is too hard to use.

Acrylic processing aids as processing aids are acrylic acid and acrylic acid esters such as methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, and 2-ethylhexyl acrylate. , A group of polymers mainly composed of methacrylic acid ester such as ethyl methacrylate, n-butyl methacrylate, and 2-ethylhexyl methacrylate. Specifically, for example, commercially available METRABLEN P-700 manufactured by Mitsubishi Rayon. , Metabrene P-551, Metabrene P-530A, Metabrene L-1000, Kane Ace PA-20, Kane Ace PA-100, Asahi Denka Kogyo Mark LS-3, Mark LS-5 etc.

The fatty acid tin stabilizer as a processing aid is, for example, dibutyltin laurate, dibutyltin stearate, dibutyltin dilaurate, dibutyltin distearate, or the like.

The organic zinc as a processing aid is, for example, zinc stearate, zinc laurate, zinc oleate, or the like.

Acrylic processing aids or fatty acid tin stabilizers, or organic acid zinc, or these, for ethylene-based random or block copolymer resin compositions having a methyl methacrylate content of 18% or more It is possible to add two or more blends of the above as processing aids, and as appropriate other additives to this blend, such as UV absorbers, antioxidants, pigments, etc. well known in the technical field of this type. It is also possible to do so.

[0011] These blends depend on the type and amount of the copolymer, the polyolefin resin to be added, the processing aid, and the suitable temperature range for calendering is 100 to 220 ° C, preferably 120 to 200 ° C. . If the temperature is 100 ° C or lower, it will not be formed into a sheet due to insufficient melting, and if it is 220 ° C or higher, it will adhere to the roll and will not separate from the roll due to excessive melting.

The surface layer 3 comprises 100 to 20 parts by weight of ethylene / α-olefin copolymer rubber, preferably 90 to 20 parts by weight, and 0 to 80 parts by weight of polyolefin resin, preferably 10 to 80 parts by weight. Or a mixture obtained by further mixing 3 to 100 parts by weight, preferably 5 to 100 parts by weight of a peroxide non-crosslinking type hydrocarbon rubber substance and / or a mineral oil type softening agent with this mixture in the presence of a crosslinking agent. And a partially cross-linked copolymer rubber composition obtained by dynamically heat-treating the sheet with the ethylene resin composition of the intermediate layer 2 in a proportion of 30% or more. When the content of the resin is 30% or less, adhesion with the intermediate layer becomes weak.

The ethylene / α-olefin-based copolymer rubber is, for example, ethylene-propylene copolymer rubber, ethylene-butadiene copolymer rubber, ethylene-butene copolymer rubber or the like, and ethylene and α-olefin having 3 to 14 carbon atoms. -A substantially amorphous copolymer rubber based on olefins or mixtures thereof.

The polyolefin resin to be mixed with the ethylene / α-olefin copolymer rubber is a homopolymer of 1-olefin such as ethylene, propylene, butene-1 or a copolymer of two or more kinds thereof or α-olefin. Copolymers with 15 mol% or less of other polymerizable monomers, for example, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer Examples thereof include polymers, ethylene-methacrylic acid copolymers and ethylene-methyl methacrylate copolymers.

Non-crosslinking type hydrocarbon rubber-type substances such as polyisobutylene, butyl rubber, propylene-ethylene copolymer rubber containing 70 mol% or more of propylene, propylene-1-butene copolymer rubber, atactic polypropylene, etc. It is a hydrocarbon type rubber-like substance that does not crosslink even when mixed with a peroxide such as the above and kneaded under heating, and does not deteriorate in fluidity. Polyisobutylene, butyl rubber and propylene-1-butene copolymer rubber are It is preferable.

Mineral oil-based softeners usually weaken the intermolecular action of rubber during rubber roll processing, facilitate processing, and help disperse carbon black, white carbon, etc., or the hardness of vulcanized rubber. Is a petroleum fraction with a high boiling point that is used for the purpose of increasing the flexibility and elasticity of the oil, and uses paraffin-based, naphthene-based, or aromatic-based oil fractions.

Crosslinking agents include organic peroxides, sulfur, phenolic vulcanizing agents, oximes, and polyamides.

The surface layer 3 may be provided with a texture pattern or the coating material 4 may be optionally applied.

[Effect of device]

 According to the present invention, an intermediate layer made of an ethylene-based random or block copolymer resin composition sheet having a methyl methacrylate content of 18% or more is laminated on the upper surface of a base cloth, and ethylene / α- Since a surface layer made of a sheet obtained by mixing 30% or more of the ethylene resin composition with respect to the mixture of the olefin copolymer rubber and the polyolefin resin is laminated, the layer becomes flexible and soft. It is possible to improve the adhesive strength when hot.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of the present invention.

FIG. 2 is a plan view.

[Explanation of symbols]

 1: base cloth, 2: intermediate layer, 3: surface layer, 4: paint layer

Claims (2)

[Scope of utility model registration request] 1. An intermediate layer made of an ethylene random or block copolymer resin composition sheet having a methyl methacrylate content of 18% or more is laminated on the upper surface of a base fabric,
On the upper surface of the intermediate layer, 30% with respect to the mixture of ethylene / α-olefin copolymer rubber and polyolefin resin.
Synthetic resin leather in which a surface layer made of a sheet obtained by mixing the above ethylene-based resin composition is laminated 2. The content of methyl methacrylate is 18%.
The synthetic resin leather according to claim 1, wherein the ethylene-based random or block copolymer resin composition has a melting point of 80 ° C or higher.