COMPOSICIONES DE POLIOLEFINA QUE EXHIBEN RESISTENCIA AL CALOR, BAJOS EXTRACTOS DE HEXANO Y MODULO CONTROLADO

• Main Authors: WHITEMAN NICOLE F, PRADEEP JAIN, STEWART KENNETH B, LONNIE G. HAZLITT, SEEMA V. KARANDE, MERGENHAGEN LAURA K, DEGROOT JACQUELYN A, MOLDOVAN DAN G
• Format: Patent
• Language: Spanish
• Published: 07.05.1997
• Edition: 6
• Subjects: ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS,e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES,DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; CONVEYING; DYES; GENERAL PROCESSES OF COMPOUNDING; HANDLING THIN OR FILAMENTARY MATERIAL; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ORGANIC MACROMOLECULAR COMPOUNDS; PACKAGES; PACKAGING ELEMENTS; PACKING; PAINTS; PERFORMING OPERATIONS; POLISHES; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; STORING; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF MATERIALS AS ADHESIVES; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

1. UNA MEZCLA DE POLIMERO QUE COMPRENDE (A) DE 15 A 60 POR CIENTO EN PESO, BASADO EN UN PESO TOTAL DE LA MEZCLA, DE AL MENOS UN PRIMER PO- LIMERO DE ETILENO QUE ES UN POLIMERO DE ETILENO SUSTANCIALMENTE LINEAL QUE TIENE UNA DENSIDAD EN EL RANGO DE 0.850 A 9.920 g/cc EN DONDE EL POLIME- RO DE ETILENO SUSTANCIALMENTE LINEAL SE CARACTERI- ZA ADICIONALMENTE COMO TENIENDO (i) UNA PROPORCION DE FLUJO DE FUSION I[sub 10]/I2 MAYOR O IGUAL 5.63, (ii) UNA DISTRIBUCION DE PESO MOLECULAR, Mw/m[sub n], COMO SE DETERMINO POR LA CROMATOGRA- FIA DE PERMEANCIA DE GEL Y SE DEFINIO POR LA ECUACION: (iii) UNA REOLOGIA DE EXTRUSION DE GAS TAL QUE LA PROPORCION DE DESGARRAMIENTO CRITICO DE LUGAR DE FRACTURA DE FUSION SUPERFICIAL PARA EL POLIMERO DE ETILENO SUSTANCIALMENTE LINEAL ES AL MENOS 50 POR CIENTO MAYOR QUE LA PROPORCION DE DESGARRAMIENTO CRITICO EN LUGAR DE LA FRACTURA DE FUSION DE LA SUPERFICIE PARA UN POLIMERO DE ETILENO LINEAL, EN DONDE EL POLIMERO DE ETILENO SUSTANCIALMENTE LI- NEAL Y EL POLIMERO DE ETILENO LINEAL COMPRENDEN EL MISMO COMONOMERO O COMONOMEROS, EL POLIMERO DE ETILENO LINEAL TIENE UN I2, Mw/Mn Y DENSIDAD DEN- TRO DEL 10 POR CIENTO DEL POLIMERO DE ETILENO SUSTANCIALMENTE LINEAL Y EN DONDE LAS PROPIEDADES DE DESGARRAMIENTO CRITICAS RESPECTIVAS DEL POLIME- RO DE ETILENO SUSTANCIALMENTE LINEAL Y EL POLIMERO ETILENO LINEAL SE MIDEN A LA MISMA TEMPERATURA DE FUSION USANDO UN REOMETRO DE EXTRUSION POR GAS, Y iv. UNA CALORIMETRIA POR BARRIDO DIFERENCIAL, UNI- CA DSC, PICO DE FUSION ENTRE -30 GRADOS Y -150 GRADOS CENTIGRADOS, Y B) DE 40 A 85 POR CIENTO EN PESO, BASADO EN EL PE- SO TOTAL DE LA MEZCLA, DE AL MENOS UN SEGUNDO PO- LIMERO DE ETILENO QUE ES UN POLIMERO DE ETILENO DE ALTA DENSIDAD HOMOGENEAMENTE RAMIFICADO, HETEREO- GENEAMENTE RAMIFICADO LINEAL QUE TIENE UNA DENSI- DAD EN EL RANGO DE 0.890 A 0.965 g/cc; EN DONDE LA MEZCLA DEL POLIMERO SE CARACTERIZA PORQUE TIENE UNA DENSIDAD ENTRE 0.890 Y 0.930 g/cc, UNA DIFERENCIAL ENTRE LAS DENSIDADES DEL PRIMER POLIMERO DE ETILENO Y EL SEGUNDO POLIMERO DE ETILENO DE AL MENOS 0.015 g/cc, Y UN PORCENTAJE DE CRISTALINIDAD RESIDUAL PRC, SEGUN SE DEFINIO POR LA ECUACION: PCR MENOR O IGUAL 5.0195 x 10 [exp 4] (p) - 2/7062 x 10 [exp 4] (P)2 - 2.3246 x 10 [exp 4] EN DONDE p ES LA DENSIDAD DE LA MEZCLA DEL POLIME- RO EN gramos.cm. cubicos. The subject invention provides a polymer mixture having high heat resistivity, low hexane extractive and controllably lower or higher modulus. The mixture is comprised of at least one first substantially linear ethylene polymer, Component (A), and at least one second ethylene polymer which is a homogeneously branched polymer, heterogeneously branched linear polymer or a non-short chain branched linear polymer. When fabricated into film, the mixture is characterized by a heat seal initiation temperature which is substantially lower than its Vicat softening point as well as a high ultimate hot tack strength. When fabricated as a molded article, the mixture is characterized by high microwave warp distortion while maintaining a lower modulus. The polymer mixture is particularly well-suited for use in multilayer film structures as a sealant layer for such applications as cook-in packages, hot-fill packages, and barrier shrink films. In molding applications, the mixture is well-suited as freezer-to-microwave food storage containers and lids which maintain good flexibility at low temperature to allow easy openability of such containers.