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1. (WO1991017886) MULTILAYER HEAT SHRINKABLE POLYMERIC FILM CONTAINING RECYCLE POLYMER
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/017886 International Application No.: PCT/US1991/003287
Publication Date: 28.11.1991 International Filing Date: 16.05.1991
Chapter 2 Demand Filed: 04.11.1991
IPC:
B29B 17/00 (2006.01) ,B29C 61/06 (2006.01) ,B32B 27/08 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
29
WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
B
PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
17
Recovery of plastics or other constituents of waste material containing plastics
B PERFORMING OPERATIONS; TRANSPORTING
29
WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
C
SHAPING OR JOINING OF PLASTICS; SHAPING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; AFTER- TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
61
Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
06
Making preforms having internal stresses, e.g. plastic memory
B PERFORMING OPERATIONS; TRANSPORTING
32
LAYERED PRODUCTS
B
LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
27
Layered products essentially comprising synthetic resin
06
as the main or only constituent of a layer next to another layer of a specific substance
08
of synthetic resin of a different kind
Applicants:
E.I. DU PONT DE NEMOURS AND COMPANY [US/US]; 1007 Market Street Wilmington, DE 19898, US
Inventors:
KNEALE, Timothy, M.; US
ROBERTS, Richard, Kenneth; US
SNYDER, John, Douglas; US
Agent:
TOCKER, Edwin ; E.I. du Pont de Nemours and Company Legal/Patent Records Center 1007 Market Street Wilmington, DE 19898, US
KAEDING, Konrad, S.; E.I. Du Pont de Nemours and Company Legal/Patent Records Center 1007 Market Street Wilmington, DE 19898, US
Priority Data:
525,02018.05.1990US
692,14702.05.1991US
Title (EN) MULTILAYER HEAT SHRINKABLE POLYMERIC FILM CONTAINING RECYCLE POLYMER
(FR) FILM POLYMERE MULTICOUCHE THERMORETRECISSABLE CONTENANT DU POLYMERE RECYCLE
Abstract:
(EN) The use of multilayer heat shrinkable film for advantageous high shrinkage but low shrinkage force is combined with the use of recycle scrap of such film to provide multilayer heat shrinkable film retaining these advantageous properties. Exemplary of the film is a core of a blend of certain linear low density polyethylene with certain highly branched low density polyethylene sandwiched between two relatively thin outer layers of propylene/ethylene copolymer, with the core also containing recycle scrap of the multilayer film.
(FR) L'utilisation de films multicouches thermorétrécissables ayant l'avantage d'offrir une forte capacité de rétrécissement mais une faible force de rétrécissement est combinée à l'utilisation de déchets recyclés provenant de films de ce type pour obtenir un film multicouche thermorétrécissable conservant ces propriétés avantageuses. Ledit film est composé d'une couche centrale constituée par un mélange de certains polyéthylènes à faible densité linéaire et de certains polyéthylènes à faible densité fortement ramifiés, prise en sandwich entre deux couches externes relativement minces de copolymère d'éthylène ou de propylène, la couche centrale contenant également des déchets recyclés provenant également des déchets recyclés provenant du film multicouche.
Designated States: CA, JP
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0528980CA2083258