- Email: [email protected]
Low migration pvc cling film
vol. 17, No. 10, Page 3
LOW MIGRATION PVC CLING FILM
The European Plasticized PVC Film Manufacturers Association has developed a new grade of film called FRESHCLING, which is a low migratory PVC cling film that meets voluntary standards agreed by manufacturers within the EEC. It is designed to replace existing films of this type. The additives used in FRESHCLING are said to be more expensive than those used in general-purpose PVC cling films. The film is identifiable by a distinctive pink tint. Europ. PLast. News, 1987, 2,
URETHANE/POLYAMIDE STABILIZER IN THE PROCESSING OF ACETALS
(Aug.), 6
It has been found that when acetal homopolymers are meltcompounded with a small amount of a blend of selected thermoplastic polyurethanes and nylons, the compositions exhibit improved hydrolytic and oxidative stability, virtually no mould deposit under normal conditions, reduced formaldehyde odour, and no significant sacrifice in the normally good mechanical properties associated with acetal homopolymers. Design Eng., 1987, (Aug.), 14
STARCH-BASED BLOWN FILMS
Urea and polyols were added to starch-poly(ethylene-co-acrylic acid) (EAA) formulations to facilitate preparation and to improve economics and quality of starch-based films designed for biodegradable agricultural mulch. A urea-containing blend was evaluated in a pilot-plant run. Principal benefit of the urea was to improve the gelatinization of starch at low levels of water, thus allowing direct extrusion of a uniform film from a semidry blend (-16% H20) and avoiding the need to premix starch-EAA in a heavy-duty mixer with large amounts of water prior to extrusion processing. Initial tensile strengths of urea-containing film were generally lower than those made by the premix method, but after water soaking to remove the urea, the tensile 'strengths were nearly equal to those made without urea. Glycerol and starch-derived polyols can be added to starch-ERA systems to increase percentage of biodegradable component without adversely affecting physical properties of the films. Ind. Eng. Chem. Res., 1987, 26,
DEGRADATION.MECHANISM OF RUBBER ~L~ANIZATES
1659-1663
A critical discussion is presented of the influence of chemical degradation mechanisms on the mechanical properties, especially stress relaxation, of vulcanized rubber. The response of the vulcanizate is interpreted in terms of the kinetic theory of rubber elasticity. Different chemical mechanisms are explored. The influence of diluent is considered. Comparisons are made
with experiments on polyisoprenes and polyurethanes. Intern. Polymer Processing, 1987, l, (June), 198
ADDlTlVES
FOR
POLYMERS
@lW37 Elsevier S&awe Pubiisbem B.V., AmsterdamJU7/$0.00+ 2.20 Nopart of this publication may be reproduced. stored in a retrieval system, or transmitted by any form or by any means, electronic. mechanical. photocopying, recording or otherwise, without the prior permission of the publishers. (Reeders in the U.S.A. -please see special regulations listed on back cover.)
LOW MIGRATION PVC CLING FILM
The European Plasticized PVC Film Manufacturers Association has developed a new grade of film called FRESHCLING, which is a low migratory PVC cling film that meets voluntary standards agreed by manufacturers within the EEC. It is designed to replace existing films of this type. The additives used in FRESHCLING are said to be more expensive than those used in general-purpose PVC cling films. The film is identifiable by a distinctive pink tint. Europ. PLast. News, 1987, 2,
URETHANE/POLYAMIDE STABILIZER IN THE PROCESSING OF ACETALS
(Aug.), 6
It has been found that when acetal homopolymers are meltcompounded with a small amount of a blend of selected thermoplastic polyurethanes and nylons, the compositions exhibit improved hydrolytic and oxidative stability, virtually no mould deposit under normal conditions, reduced formaldehyde odour, and no significant sacrifice in the normally good mechanical properties associated with acetal homopolymers. Design Eng., 1987, (Aug.), 14
STARCH-BASED BLOWN FILMS
Urea and polyols were added to starch-poly(ethylene-co-acrylic acid) (EAA) formulations to facilitate preparation and to improve economics and quality of starch-based films designed for biodegradable agricultural mulch. A urea-containing blend was evaluated in a pilot-plant run. Principal benefit of the urea was to improve the gelatinization of starch at low levels of water, thus allowing direct extrusion of a uniform film from a semidry blend (-16% H20) and avoiding the need to premix starch-EAA in a heavy-duty mixer with large amounts of water prior to extrusion processing. Initial tensile strengths of urea-containing film were generally lower than those made by the premix method, but after water soaking to remove the urea, the tensile 'strengths were nearly equal to those made without urea. Glycerol and starch-derived polyols can be added to starch-ERA systems to increase percentage of biodegradable component without adversely affecting physical properties of the films. Ind. Eng. Chem. Res., 1987, 26,
DEGRADATION.MECHANISM OF RUBBER ~L~ANIZATES
1659-1663
A critical discussion is presented of the influence of chemical degradation mechanisms on the mechanical properties, especially stress relaxation, of vulcanized rubber. The response of the vulcanizate is interpreted in terms of the kinetic theory of rubber elasticity. Different chemical mechanisms are explored. The influence of diluent is considered. Comparisons are made
with experiments on polyisoprenes and polyurethanes. Intern. Polymer Processing, 1987, l, (June), 198
ADDlTlVES
FOR
POLYMERS
@lW37 Elsevier S&awe Pubiisbem B.V., AmsterdamJU7/$0.00+ 2.20 Nopart of this publication may be reproduced. stored in a retrieval system, or transmitted by any form or by any means, electronic. mechanical. photocopying, recording or otherwise, without the prior permission of the publishers. (Reeders in the U.S.A. -please see special regulations listed on back cover.)