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1. (WO1997015627) PLASTICS ARTICLES
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1997/015627 International Application No.: PCT/GB1996/001434
Publication Date: 01.05.1997 International Filing Date: 17.06.1996
IPC:
C08J 9/00 (2006.01) ,C08J 9/08 (2006.01) ,C08L 67/02 (2006.01)
C CHEMISTRY; METALLURGY
08
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
J
WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H142
9
Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
C CHEMISTRY; METALLURGY
08
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
J
WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H142
9
Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
04
using blowing gases generated by a previously added blowing agent
06
by a chemical blowing agent
08
developing carbon dioxide
C CHEMISTRY; METALLURGY
08
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
L
COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
67
Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
02
Polyesters derived from dicarboxylic acids and dihydroxy compounds
Applicants:
BORDEN GLOBAL PACKAGING UK LIMITED [GB/GB]; Colley Lane Estate Bridgwater Somerset TA6 5LA, GB (AllExceptUS)
DUNNING, Peter, Janes [GB/GB]; GB (UsOnly)
SPARKES, Andrea [GB/GB]; GB (UsOnly)
Inventors:
DUNNING, Peter, Janes; GB
SPARKES, Andrea; GB
Agent:
WILKINSON, Stephen, John; Stevens Hewlett & Perkins 1 St Augustines Place Bristol BS1 4UD, GB
Priority Data:
9522006.727.10.1995GB
Title (EN) PLASTICS ARTICLES
(FR) ARTICLES EN PLASTIQUE
Abstract:
(EN) A foamed polyester resin article is made by a method comprising forming a molten mixture containing poly (ethylene terephthalate) having an intrinsic viscosity greater than 0.7 and a moisture content of not greater than 0.03 %, a melt viscosity modifier and a heat activatable foaming agent having a decomposition temperature greater than 150 °C, heating the mixture in the barrel of an extruder and extruding the mixture through the die of the extruder. The method can be used to produce extruded poly (ethylene terephthalate) sheet having a foamed structure suitable for subsequent thermoforming into packaging articles and food containers such as those used as dualovenable food trays used for reheating foods in microwave or conventional ovens. The articles produced by the method have a density which may be 35 - 40 % less than that of similar articles made from conventional, non-foamed poly (ethylene therephthalate).
(FR) La présente invention concerne un article en résine de polyester expansée fabriqué selon un procédé consistant à former un mélange fondu à base de PET d'une viscosité intrinsèque supérieure à 0,7 et à teneur en eau n'excédant pas 0,03 %, d'un agent modificateur de la viscosité et d'un agent moussant thermo-activable dont la température de décomposition est supérieure à 150 °C. Le procédé consiste ensuite à chauffer le mélange dans le corps d'une extrudeuse, et à extruder ce mélange au travers d'une filière de l'extrudeuse. Ce procédé convient à la production par extrusion de feuilles de PET à structure en mousse destinées à la fabrication par thermoformage ultérieur d'articles d'emballage et de récipients pour produits alimentaires tels que ceux utilisés comme barquettes alimentaires pour réchauffage bi-mode des aliments dans les fours à micro-ondes ou les fours conventionnels. Les articles produits selon ce procédé ont une densité inférieure de 35 % à 40 % à celle d'articles similaires en PET standard non expansé.
Designated States: AL, AM, AT, AU, AZ, BB, BG, BR, BY, CA, CH, CN, CZ, DE, DK, EE, ES, FI, GB, GE, HU, IL, IS, JP, KE, KG, KP, KR, KZ, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, TJ, TM, TR, TT, UA, UG, US, UZ, VN
African Regional Intellectual Property Organization (ARIPO) (KE, LS, MW, SD, SZ, UG)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0800556US6033748CA2209015AU1996062313