초록 ▼

Polypropylene resin pre-expanded particles having an expandability of 1.0 to 1.8 shown by the equation: wherein the expansion ratio of polypropylene resin pre-expanded particles after steam heating denotes the value obtained when heating the pre-expanded particles by steam having a temperature equa

Polypropylene resin pre-expanded particles having an expandability of 1.0 to 1.8 shown by the equation: wherein the expansion ratio of polypropylene resin pre-expanded particles after steam heating denotes the value obtained when heating the pre-expanded particles by steam having a temperature equal to the melting point peak temperature measured by differential scanning calorimetry of the base resin constituting the particles, the pre-expanded particles being able to be molded by various in-mold foaming methods in a shortened period of cooling time in molding to stably produce cellular molded articles having good melt adhesion of the particles and surface appearance and having uniform density in the surface and inner portions.

대표청구항 ▼

Polypropylene resin pre-expanded particles having an expandability of 1.0 to 1.8 shown by the equation: wherein the expansion ratio of polypropylene resin pre-expanded particles after steam heating denotes the value obtained when heating the pre-expanded particles by steam having a temperature equa

Polypropylene resin pre-expanded particles having an expandability of 1.0 to 1.8 shown by the equation: wherein the expansion ratio of polypropylene resin pre-expanded particles after steam heating denotes the value obtained when heating the pre-expanded particles by steam having a temperature equal to the melting point peak temperature measured by differential scanning calorimetry of the base resin constituting the particles, the pre-expanded particles being able to be molded by various in-mold foaming methods in a shortened period of cooling time in molding to stably produce cellular molded articles having good melt adhesion of the particles and surface appearance and having uniform density in the surface and inner portions. eferences] Patent Abstracts of Japan, vol. 1998, No. 05, Apr. 30, 1998 & JP 10 000652 A (Toyoda Gosei Co Ltd), Jan. 6, 1998. Patent Abstracts of Japan, vol. 1998, No. 05, Apr. 30, 1998, & JP 10 000653 A (Toyoda Gosei Co Ltd), Jan. 6, 1998. Patent Abstracts of Japan, vol. 011, No. 082, (M-571), Mar. 12, 1987 & JP 61 237611 A (Toyota Motor Corp), Oct. 22, 1986. Patent Abstracts of Japan, vol. 012, No. 381, (M-752), Oct. 12, 1988 & JP 63 134209 A (Nippon Plast Co Ltd), Jun. 6, 1988. Patent Abstracts of Japan, vol. 1998, No. 02, Jan. 30, 1998 & JP 09 277304 A (Nippon Plast Co Ltd), Oct. 28, 1997. Patent Abstracts of Japan, vol. 017, No. 382 (C-1085), Jul. 19, 1993 & JP 05 065694 A (Isuzu Motors Ltd), Mar. 19, 1993. Database WPI, Section Ch, Week 199252 Derwent Publications Ltd., London, GB; Class A32, AN 1992-430659 XP002138203 & JP 04 329112 A (Isuzu Motors Ltd), Nov. 17, 1992.