Aromatic vinyl polymer resin composition and its molding

a technology of acrylic polymer and resin composition, which is applied in the direction of transportation and packaging, rigid containers, packaging, etc., can solve the problems of increased expansion ratio, reduced surface smoothness and glossiness, and loss of high-quality appearance, etc., and achieves good surface smoothness and good gloss. balanced

Inactive Publication Date: 2006-05-04
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] An object of the present invention is to provide an aromatic vinyl polymer resin composition suitable to molding into resin foam sheets having good surface smoothness and glossiness well balanced with the mechanical strength thereof even when the expansion ratio in molding it is increased, and to provide resin foam sheets and containers of the composition.

Problems solved by technology

However, the resin foam sheets and moldings have a problem in that their surface smoothness and glossiness may lower and lose a feel of high-quality appearance with the increase in their expansion ratio.
The problem of poor surface condition of the sheets and moldings leads to another problem when they are directly printed with ink in a mode of profile printing, in that the appearance of their printed surfaces is extremely bad.
However, the method of controlling the expansion ratio in molding the resin and the method of laminating the moldings with a non-foam film increase the production costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

(1) Preparation of Aromatic Vinyl Polymer Resin:

[0036] A. polyfunctional initiator, 2,2-bis(4,4-di-tert-butylperoxycyclohexyl)propane (Perkadox 12, made by Kayaku Akuzo Corporation) and a solvent, ethylbenzene were added to styrene to prepare a monomer solution. The amount of the initiator added was 350 ppm of styrene, in terms of the pure product of the compound; and that of the solvent was 8% by mass of styrene.

[0037] At a flow rate of 20 liters / hr, the monomer solution was continuously introduced into a polymerization unit of four reactors connected in series. Concretely, it was first led into a first, 20-liter complete-mixing type reactor kept at 112° C., and the resulting polymer was led into a second, 20-liter complete-mixing type reactor kept at 120° C., then into a third, 30-liter plug-flow reactor kept at 140° C., and finally into a fourth, 30-liter plug-flow reactor kept at 165° C. in that order. In the polymerization unit, the monomer was polymerized to a final convers...

example 2

(1) Preparation of Aromatic Vinyl Polymer Resin:

[0049] An aromatic vinyl polymer resin was prepared in the same manner as in the step (1) in Example 1, for which, however, the temperature in the third reactor was 145° C. and the temperature in the fourth reactor was 162° C.

(2) Production of Aromatic Vinyl Polymer Resin Composition:

[0050] Using the aromatic vinyl polymer resin obtained in the above (1), a resin composition was produced in the same manner as in the step (2) in Example 1.

(3) Production and Evaluation of Resin Foam Sheet:

[0051] In the same manner as in the step (3) in Example 1, the aromatic vinyl polymer resin composition obtained in the above (2) was molded into a resin foam sheet and the sheet was evaluated.

(4) Fabrication and Evaluation of Food Trays:

[0052] In the same manner as in the step (4) in Example 1, the resin foam sheet obtained in the above (3) was molded into food trays and the food trays were evaluated.

[0053] The results are given in Table 1....

example 3

(1) Preparation of Aromatic Vinyl Polymer Resin:

[0054] An aromatic vinyl polymer resin was prepared in the same manner as in the step (1) in Example 1 except for the following points: The polyfunctional initiator was divided into two portions, 300 ppm and 130 ppm, and the former was added to the monomer solution while the latter was led into the third reactor. The flow rate of the monomer solution led into the polymerization unit was 23 liters / hr. The temperature was 120° C. in the first reactor, 125° C. in the second reactor, 130° C in the third reactor and 140° C. in the fourth reactor.

(2) Production of Aromatic Vinyl Polymer Resin Composition:

[0055] Using the aromatic vinyl polymer resin obtained in the above (1), a resin composition was produced in the same manner as in the step (2) in Example 1.

(3) Production and Evaluation of Resin Foam Sheet:

[0056] In the same manner as in the step (3) in Example 1, the aromatic vinyl polymer resin composition obtained in the above (2...

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Abstract

Provided are an aromatic vinyl polymer resin composition capable of being molded into resin foam sheets having good surface smoothness and glossiness well balanced with the mechanical strength thereof even when the expansion ratio in molding is increased, and resin foam sheets and containers of the composition. The resin composition comprises (A) from 80 to 98% by mass of an aromatic vinyl polymer resin having a weight-average molecular weight measured through GPC of from 200,000 to 400,000, a ratio of weight-average molecular weight to number-average molecular weight ranging from 2.2 to 3.6, a number of branches of from 0.1 to 1.0 in one molecule having an absolute molecular weight of 1,190,000 measured through GPC-MALLS, and a melt flow rate of from 1.5 to 3.5 g / 10 min, and (B) from 2 to 20% by mass of a styrene-diene block copolymer or its hydrogenate. This is molded into a resin foam sheet through extrusion foaming, and the sheet is thermoformed into containers.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an aromatic vinyl polymer resin composition and its moldings. More precisely, the invention relates to an aromatic vinyl polymer resin composition suitable to molding into resin foam sheets having a good appearance well balanced with the mechanical strength thereof even when the expansion ratio in molding is increased, and to its resin foam sheets and containers. [0003] 2. Description of the Related Art [0004] Aromatic vinyl polymer resin, especially atactic polystyrene resin is a plastic material inexpensive and having the advantages of good extrudability, injection moldability and fabricability, and it has many applications, for example, for electric appliances for household use, implements for office use and food wrapping and packaging materials. In particular, since resin foam sheets and moldings of such aromatic vinyl polymer resin are easy to fabricate and are tough and have go...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08L53/00B65D1/00B65D65/02C08J9/00C08J9/12C08L25/00C08L25/06C08L53/02
CPCC08J9/0061C08J9/122C08J2201/03C08J2325/06C08J2453/00C08L25/06C08L53/02C08L2666/24
Inventor HIROTA, SHOGOOKUMURA, RYOZOWAKABAYASHI, MAKOTO
Owner IDEMITSU KOSAN CO LTD
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