JPH01266166A - Synthetic resin composition - Google Patents

Abstract

PURPOSE:To improve the hot water resistance of a specified synthetic resin, by incorporating an alkylketene dimer therein. CONSTITUTION:100pts.wt. synthetic resin (e.g., polybutylene terephthalate) having carboxyl, hydroxyl, or amino groups at the end of its main chain or on its side chain is mixed with 0.01-5pts.wt. alkylketene dimer of the formula (wherein R is a 6-20C, preferably 10-16C, alkyl) (e.g., laurylketene dimer) and, if necessary, a coloring agent, a lubricant, an antistatic agent, a filler, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a composition obtained by modifying a synthetic resin having a carboxyl group, a hydroxyl group, or an amino group at the end of the main chain or in the side chain of the resin.

[Prior art and problems to be solved by the invention] Synthetic resins having a carboxyl group, hydroxyl group, or amino group at the end of the main chain or side chain of the synthetic resin (polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polyamide, modified polyphenylene oxide) , polyacetal, etc.) have excellent performance in themselves and are used in many applications as engineering plastics. However, carboxyl groups, hydroxyl groups, and amino groups present at the ends of the main chain, side chains, particularly at the ends of the main chain, may cause deterioration of the thermal stability, particularly hot water resistance, of the synthetic resin.

Conventionally, for example, a method of adding cycloalkane chloride as a terminal terminator for polycarbonate (Japanese Patent Application Laid-open No. 59-4
No. 646) or adding an epoxy resin to improve the thermal stability of polyester, but neither method was sufficient in terms of improving hot water resistance.

[Means to solve the problem]

The present inventors have developed a synthetic resin (
As a result of extensive research into ways to improve the hot water resistance of polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polyamide, modified polyphenylene oxide, etc., we discovered that a specific alkyl ketene dimer functions as a good thermal stability improver. The present invention has now been completed.

That is, the present invention provides a synthetic resin having a carboxyl group, a hydroxyl group, or an amino group at the end of the main chain or in a side chain, R-CH=C-0 + 1 (1) R-CH-C=0 (wherein R relates to a synthetic resin composition containing an alkyl ketene dimer represented by an alkyl group having 6 to 20 carbon atoms.

The synthetic resin composition obtained by the present invention is particularly suitable for applications requiring improved hot water resistance, complex molded parts, and the like.

The present invention will be specifically explained below.

In the present invention, resins having a carboxyl group, hydroxyl group, or amine group at the end of the main chain or in a side chain include crystalline polyesters such as polyethylene terephthalate and polybutylene terephthalate, polycarbonate, polyamide, modified polyphenylene oxide, polyimide, and polyether. These include liquid crystalline polyesters containing ketones and parahydroxybenzoic acid as one component.

The alkyl ketene dimer used in the present invention is represented by the general formula (1) above, and among them, those in which R has 10 to 16 carbon atoms are preferred.

In the present invention, the alkyl ketene dimer may be added either during the resin production polymerization process or during extrusion kneading. The amount added is preferably 0.01 to 5 parts by weight, more preferably 0.5 to 3 parts by weight. Addition amount is 0. If it is less than 5 parts by weight, the desired effect will not be so great, and if it exceeds 5 parts by weight, the heat distortion temperature will decrease, which is not preferable.

If necessary, a colorant, a lubricant, an antistatic agent, or a filler such as glass fiber or filler may be added to the resin composition to which the alkyl ketene dimer of the present invention is added.

〔Example〕

The present invention will be specifically explained below using Examples, but the present invention is not limited by these in any way.

Examples 1-6. Comparative Examples 1 to 3 2 parts by weight of the alkyl ketene dimer of the present invention were added to 100 parts by weight of the synthetic resin, mixed in a Henschel mixer, extruded at 220 to 250°C, and then injected using the pellets. A test piece was created by molding.

Place the test piece in an autoclave with water,
It was heated at 130°C for 24 hours. Thereafter, the tensile strength was measured and compared with the tensile strength before hot water treatment. In addition, for comparison, the same procedure was conducted for a sample without the addition of an alkyl ketene dimer. The results are shown in Table 1.

From the above results, it can be seen that in the case of the resin containing the alkyl ketene dimer of the present invention, there is no deterioration in physical properties after boiling in hot water.

Claims (1)

[Claims] 1 Synthetic resins having a carboxyl group, hydroxyl group, or amino group at the end of the main chain or in a side chain ▲There are numerical formulas, chemical formulas, tables, etc.▼(1) (In the formula, R is a carbon number of 6 A synthetic resin composition prepared by adding an alkyl ketene dimer represented by 20 to 20 alkyl groups. 2. The synthetic resin composition according to claim 1, wherein R in the general formula (1) is an alkyl group having 10 to 16 carbon atoms.