JPS58210953A - Crosslinked vinyl chloride resin composition giving partially colored moldings - Google Patents

Abstract

PURPOSE:A composition that is obtained by combining a colored PVC resin which has been crosslinked with an agent, with a usual PVC resin, thus giving partially colored moldings with high-class appearance in low costs without postprocessing. CONSTITUTION:The objective composition comprises (A) a vinyl chloride resin which has been crosslinked with an agent and colored and (B) a usual vinyl chloride resin at a weight A/B ratio of 1/99-50/50. As component A, is preferred a combination of 2 or more differently colored vinyl chloride resins. The crosslinking agent is preferably used by 0.1-10wt% based on the vinyl chloride monomer in component A, resulting in 1-80wt% gel fraction in tetrahydrofuran. Component A remains in isolated state in the matrics of component B, when the composition is molded, thus giving partially colored moldings by only molding.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vinyl chloride resin (hereinafter referred to as PVC resin) composition for obtaining a partially colored molded article with a luxurious feel.

Conventionally, methods for obtaining partially colored molded objects include dyeing the molded object in post-processing, or sandwiching colored resin, colored paper, or C-colored plastic between PvC films and pressing them. There are three ways to do it. In any case, these require extra power, and the cost is 1,000 yen as it requires equipment and personnel costs.

becomes.

The present invention improves on such drawbacks and relates to a PVC resin composition that can be used to produce partially colored molded products by a method that does not cause pull-out forces.

The present invention includes a resin composition consisting of (g) a colored PVC resin crosslinked with a crosslinking agent and (i) a conventional PVC resin.

To explain the present invention in detail, PVC during molding (a)
The system resin does not gel and remains independently in the molded body 1, β]
The PVC resin gels and becomes the continuous phase of the molded article. Therefore, if the PVC material of (a) is colored in advance, a partially colored molded product can be obtained at one time by molding.

To explain the present invention in more detail, the PVC used in (a)
The resin is a PVC resin crosslinked with a crosslinking agent. The crosslinking agent C herein may be any compound having two or more double bonds that can be copolymerized with hibinyl. Specifically, diacrylates or dimethacrylates of polyalkylene glycols such as ethylene glycol, polyethylene glycol, 1,3-propylene glycol, and poly-1,3-propylene glycol, diallyl phthalate, diallyl maleate, diallyl fumarate, and diallyl. Examples include diallyl compounds such as succinate, divinylbenzene, and the like.

The PVC resin used in W can be easily obtained by known polymerization techniques such as suspension polymerization, bulk polymerization, and gas phase polymerization.

The amount of the above-mentioned crosslinking agent used at this time is preferably in the range of 0.1 to 10% by weight based on the vinyl chloride monomer.

If the amount used is less than 0.1% by weight, the crosslinking effect will be weak;
B) It is specially kneaded with PVC resin for processing and molding, making it impossible to achieve the purpose. If it exceeds 10% by weight, the elongation and tensile strength of the molded product will decrease, which is not preferable. The gel fraction of the PVC resin (a) thus obtained in THF solvent is about 1 to 80% by weight.

In addition, the [F] PVC resin used in the present invention is non-crosslinked PVC that can be molded under normal extrusion conditions with a general processing molding machine.
It is a type resin. Generally, commercially available PVC resins fall within this range.

There are two methods for coloring the PVC resin in (a): a method in which predetermined dyes and pigments are added in advance during the resin production in (g) and the resin is colored, and a method in which the resin is colored after the resin is produced in (b). There is a way to do it. In the former method, it is preferable to use dyes and pigments that do not have the effect of inhibiting vinyl chloride polymerization. The latter post-coloring method can be applied when using dyes or pigments that have the effect of inhibiting vinyl chloride polymerization.

As a post-coloring method, there is a method of coloring by dissolving a specified dye or pigment in a solvent, but in terms of cost and process, cross-linked P
After producing VC, dyes, pigments, etc. are added to the production container, and the PVC of (5) is impregnated with vinyl chloride and colored.
It is preferable to obtain a based resin.

The dyes and pigments used in the present invention are not particularly limited. The amount used may be 1 part by weight or less based on the crosslinked PVC resin. The appropriate amount of solvent used for impregnation is 30 to 100 parts by weight based on the crosslinked PVC resin. The impregnation temperature is 20
Appropriate impregnation time is 30 minutes to 120 minutes under stirring at ~70°C.

The present invention - cc, (AI... Resin. The ratio used is 6. There is no particular 6 constant, but the (A) / skewer) weight ratio is 1/99 to 50.
About 150 is good. This is because if the amount of 4 is too small, it will give a feeling of foreign matter being mixed in, and if it is too large, the physical properties of the molded product, such as tensile strength and elongation, will deteriorate, which is undesirable.

In addition, in the present invention, (the crosslinked colored resin used as the AJ resin may be one type or two or more types. Specifically,
A resin colored in red may be used alone, or two types of resins colored separately in red and blue may be used together. In this way, (a) two or more different colored pvcst resins are used as resins.
The present invention is particularly useful when fats are used in combination.

Note that (a) and β) the resin may be a copolymer of K, a monomer copolymerizable with vinyl chloride, and a predominant amount (by weight) of vinyl chloride, other than ordinary homoPVC.

The resin composition of the present invention is molded under normal processing and molding conditions for PVC resins. That is, it is preferable to process and mold the resin composition of the present invention in combination with one or more compounds selected from known stabilizers, lubricants, fillers, reinforcing agents, and plasticizers.

Examples of the present invention will be shown below, but these are not intended to limit the present invention in any way.

Examples 1 to 6, Comparative Example 1.2 Preparation of Sample A PVC crosslinked with a diacrylate modified product of tetraethylene glycol (I'HF gel fraction: 35% by weight)
10 Ky, red dye soup: / ill 3 y, internal volume 501 with stirring blade for water 201! PVC is charged into the reactor and degassed to produce 10KF of vinyl chloride! 3 at 50°C.
After stirring for 0 minutes, vinyl chloride was recovered to obtain crosslinked PVC colored red.

Preparation of Sample B PVC crosslinked with diacrylate modified diethylene glycol (THF gel fraction 25%) 20KF!
, Blue dye methylene glue 5y was charged into a reactor with an inner volume of 50j' equipped with a stirring blade, and after degassing, it was charged with vinyl chloride 20, and after stirring at 40°C for 60 minutes, the vinyl chloride was recovered and colored blue. Cross-linked PvC? (I was.

Preparation of Sample C Dinople A was prepared in the same manner as Sample A except that a commercially available non-crosslinked Kanevinyl 51007 (manufactured by Kane, 1B Kagaku Kogyo @) was used instead of crosslinked 1700. A red colored PVC was obtained.

Preparation of Sample D In the preparation of Sample B, the following steps were taken:
PVC colored red was obtained in the same manner as in the preparation of sample B.

Samples A, B, C, and D thus obtained and Kanevinyl 51007 were blended according to the recipe A and A and the recipe was used to make a sheet with a thickness Q of 3 mm using a 50# extruder. Table 1 shows the degree of coloring of this sheet.

Formulation Table A Formulation Table 1 *l The O mark means that the resin corresponding to the O mark has been blended.

*2 The degree of coloring of the sheet was determined according to the following criteria.

A: Colored portions exist completely independently.

B: The entire sheet is uniformly colored.

C: The entire sheet is almost uniformly colored blue (red), and the red (blue) colored portion exists completely independently.

From Table 1, colored crosslinked P in both hard and soft formulations
It can be seen that using vC it is possible to obtain partially colored moldings.

Patent applicant Kanebuchi Chemical Industry Co., Ltd. Agent: Patent Attorney Makoto Asano -

Claims (1)

[Scope of Claims] (1) A resin composition comprising an ordinary vinyl chloride resin ((a) and a vinyl chloride resin crosslinked with a crosslinking agent and colored). (2. In Claim 1, a resin composition in which the weight ratio of (A) to (A) is in the range of -1/99 to 50150). (3) A resin composition according to claim 1, in which the M resin is composed of two or more different colored vinyl chloride resins.