JPH0439344A - Resin composition - Google Patents

Abstract

PURPOSE:To obtain the subject resin composition capable of producing a synthetic leather having touch and water absorption properties similar to a natural leather by blending a vinyl chloride-based resin with a polyethylene oxide-based water absorption polymer having a reactive silicon group. CONSTITUTION:A resin composition obtained by blending (A) 100pts.wt. vinyl chloride-based resin, preferably partly cross-linked polyvinyl chloride, etc., with (B) 1-100pts.wt., preferably 1-50pts.wt. polyethylene oxide-based water absorption polymer having >=1, preferably 1.1-5 Si-containing groups to which OH and/or a hydrolyzable group (H, halogen, alkoxy group, etc.) is bonded, cross-linkable due to formation of siloxane bonds and having the main chain composed of 6-200 ethylene oxide units and having 100-10,000 number-average molecular weight and, as necessary, a plasticizer, an elastomer, a silanol catalyst, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a vinyl chloride resin-based resin composition that can be suitably used for applications such as genuine leather-like skin materials.

[Prior Art/Problems to be Solved by the Invention] In recent years, synthetic leather has been widely used as an alternative to genuine leather for automobile interiors, bags, and the like. As these synthetic leathers, vinyl chloride resin-based ones are generally used, but they are not satisfactory in terms of properties, especially texture (good feel) and water absorption. I haven't reached the point yet.

The present invention solves these problems with conventional synthetic leather,
The purpose of this invention is to provide a resin composition that provides synthetic leather with a feel and water absorbency equivalent to that of genuine leather.

[Means for solving/accomplishing the problem] As a result of intensive research to solve the above problem, the present inventors have achieved the objective by blending a specific water-absorbing polymer into a vinyl chloride resin. They have discovered that it is possible to do so, and have completed the present invention.

That is, the present invention provides 100 parts (by weight, the same applies hereinafter) of a captive vinyl chloride resin with (B) a silicon atom-containing group containing a silicon atom to which a hydroxyl group and/or a hydrolyzable group (hereinafter, a reactive group) is bonded. The present invention relates to a resin composition characterized in that it contains 1 to 100 parts of a polyethylene oxide-based water-absorbing polymer having at least one polyethylene oxide-based water-absorbing polymer (referred to as a silicon group) and capable of crosslinking by forming a siloxane bond.

[Example] There are no particular limitations on the vinyl chloride resin as the human ingredient used in the present invention, and any commonly used vinyl chloride resin may be used. Specific examples of such vinyl chloride resins include vinyl chloride homopolymers as well as vinyl chloride random, block, and graft copolymers.]
Le.

The vinyl chloride resin may be partially crosslinked polyvinyl chloride. In this case, the resultant product has good grain pattern retention and retention when a plasticizer is used, which is preferable.

In the present invention, component (B), a polyethylene oxide-based water-absorbing polymer having at least one reactive silicon group and capable of crosslinking by forming a siloxane bond, is used as a polyethylene oxide-based water-absorbing polymer, which is a vinyl chloride-based resin-based synthetic leather. It is used to make the properties of leather, especially the texture and water absorption properties, comparable to those of genuine leather. Furthermore, the crosslinked structure can prevent the water-absorbing polymer from bleeding or elution.

The reactive silicon group is not particularly limited, but typical examples include - Formula (1): (wherein R1 and R2 are both alkyl groups having 1 to 2 degrees of carbon atoms; An aryl group having 6 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, or (R') x 5iO- (R' is 1 to 2 carbon atoms
0 monovalent hydrocarbon group), X is a hydroxyl group and/or a hydrolyzable group, a is 0, 1.2 or 3, b is 0.1 or 2, where a
+Σb≧1 shall be satisfied, m is O or 1 to 1
Examples include an integer of 9, and m mido groups, aminooxy groups, mercapto groups, alkenyloxy groups, and the like.

At least one reactive silicon group is present in one molecule of the polyethylene oxide water-absorbing polymer, and preferably 1.1 to 5 reactive silicon groups are present.

The reactive silicon group may be present at the end of the main chain of the polyethylene oxide molecule, or may be present internally.
It may also exist in both.

The main chain of the polyethylene oxide polymer having reactive silicon groups used in the present invention is, for example, represented by Formula 123.

b may be different).

Among the groups represented by X, the hydrolyzable group is not particularly limited, and may be any conventionally known hydrolyzable group. Specifically, for example, a hydrogen atom, a halogen atom, an alkoxy group, an acyloxy group, a ketoximate group, an amino group, an amide group, an acid atom (wherein R is an organic group having 1 to 20 carbon atoms, p
and 9 each represent an integer from 1 to 500).

The main chain of the polyethylene oxide polymer in the present invention may contain repeating units other than ethylene oxide units.

The main chain of the polyethylene oxide polymer in the present invention preferably has a number average molecular weight of 100 to 10,000. In particular, a polyethylene oxide polymer having an average of 6 to 200, particularly 10 to 100 ethylene oxide units in one molecule is preferred.

In the present invention, the ratio of the component (B) to 100 parts of the component is 1 to 100 parts, preferably 1 to 50 parts, more preferably 2 to 50 parts, and more preferably 1 to 50 parts. 2 to 30 parts. B) for 100 parts of the human component
If the amount of the ingredients is less than 1 part, the water absorption will not be sufficient and the moist feel will not be achieved.

Moreover, if it exceeds 100 parts, the properties of vinyl chloride resin-based synthetic leather will be lost.

The resin composition of the present invention may contain a plasticizer or an elastomer to improve flexibility.

Furthermore, a silanol catalyst may be used as the curing catalyst.

Examples of the plasticizer include dibutyl phthalate, dioctyl phthalate, dioctyl phthalate, dibutyl adipate, dioctyl adipate, trioctyl trimellitate, and the like.

The amount of plasticizer used is 1 part per 100 parts of vinyl chloride resin.
00 parts or less is preferable, and 50 parts or less is particularly preferable.

Examples of the elastomer include butadiene-based graft copolymers, acrylate-based graft copolymers, polyester polyether block copolymers, polyester polyester block copolymers, and the like. By blending these elastomers, it is possible to reduce the amount of plasticizer used even if the flexibility is the same, and the bleeding of the plasticizer can be reduced.

The amount of elastomer used is preferably 100 parts or less per 100 parts of vinyl chloride resin, but from the viewpoint of flexibility, it is 20 to 20 parts.
80 parts is more preferred.

Examples of the silanol catalyst include titanate esters, tin carboxylates, dibutyltin diacetylacetonate, organoaluminum compounds, and amine compounds.

The resin composition of the present invention may further contain inorganic fillers such as talc and calcium carbonate, antioxidants, heat stabilizers, light stabilizers, ultraviolet absorbers, lubricants, facial dyes, and the like.

The resin composition of the present invention can be prepared by any method. For example, it is prepared by mixing using a blender, super mixer, etc., using a pressurized kneader roll, heating and mixing with an extruder, etc. The heating temperature at this time is
Although it cannot be unconditionally defined depending on the type of vinyl chloride resin used, and the type and amount of plasticizer and elastomer, it is preferably 150°C or higher in terms of crosstalk and 210°C or lower in terms of thermal stability. - The water-absorbing polymer as component (B) is gradually and substantially crosslinked in the mixing and heating crosslinking steps.

The composition obtained in the present invention may have a vinyl chloride resin and a water-absorbing polymer mixed uniformly, or may have a form in which the water-absorbing polymer is dispersed.

Hereinafter, the composition of the present invention will be specifically explained with reference to Examples.

Examples 1 to 2 and Comparative Examples 1 to 2 The following raw materials were mixed with the composition shown in Table 1, and a sheet of 170 to 100 mm was formed into a sheet of 60 m5 x 40 ssi by hot pressing in a grain pattern mold. A molded product with a thickness of 2 mm was obtained.

The properties (water absorption rate, texture, grain pattern retention) of the obtained molded article were measured by the following method. The results are shown in Table 1.

(material) Polyvinyl chloride: Polyvinyl chloride with a degree of polymerization of 1000.

Partially crosslinked polyvinyl chloride gel fraction 7% by weight.

Plasticizer: TOTM (trioctyl trimellitate)
.

Polyester polyester elastomer dipolyethylene terephthalate/polycaprolactone - 40/60 (weight ratio) block copolymer.

Water-absorbing polymer: having the following structure with an average molecular weight of about 1200.

CH3 (CHI O) z 5ICH2CH2CHz -0
(-CH2CH20+-CH3 -CH2CH2CH281(OCH3) 2 Stabilizer:
Ca-Zn, Ba-Zns epoxy composite stabilizer.

(Evaluation method) Water absorption rate: Based on ASTM D570. 230℃ water,
Determine the water absorption rate after soaking for 1 hour.

Touch: The surface of the molded product conditioned at 23° C. and 50% relative humidity is traced with a fingertip, and its moist feel is sensory evaluated. In addition, in the table, ◯ indicates good quality, and × indicates poor quality.

Grain pattern retention After the two-surface grained molded product is treated in a hot air circulation oven at 140° C. for 1 hour, the grain pattern retention is evaluated. In addition, ◎ in the table represents excellent, and O represents good.

[Margin below] [Effects of the invention] A molded product made using the composition of the present invention has a surface texture equivalent to that of genuine leather, has a water absorption function, and has good grain pattern retention. becomes.

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Claims (1)

[Scope of Claims] 1 (A) Based on 100 parts by weight of vinyl chloride resin (B
) 1 to 100 parts by weight of a polyethylene oxide-based water-absorbing polymer having at least one silicon atom-containing group to which a hydroxyl group and/or a hydrolyzable group are bonded, and which can be crosslinked by forming a siloxane bond. A resin composition characterized by: 2 Claim 1 wherein the vinyl chloride resin is polyvinyl chloride
The resin composition described. 3. The resin composition according to claim 2, wherein the polyvinyl chloride is partially crosslinked polyvinyl chloride. 4. The resin composition according to claim 1, 2 or 3, further comprising a plasticizer and/or an elastomer.