Patent · US Active

Propylene copolymer for BOPP heat seal film layers

US10696774B2 · kind B2 · utility

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13Claims

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Assignee

TOTAL RESEARCH & TECHNOLOGY FELUY · BE

Inventors

Olivier Lhost · Havré, BE
Aurélien Vantomme · Mignault, BE
Alexandre Welle · Suzeril, BE

Key dates

Filing date	Jul 9, 2014
Grant date	Jun 30, 2020
Priority date	—
Expiry date	Nov 11, 2035

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F4/65927
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A propylene-comonomer block copolymer may have a molecular weight distribution Mw/Mn of at least 1.7, a percentage of enthalpy measured between Ti and [Tm−18° C.] of at least 20% of the total enthalpy, and a ratio E1/Co of at least 0.80. The propylene-comonomer block copolymer may be produced by polymerizing propylene in the presence of at least one comonomer and a bridged metallocene catalyst. The bridged metallocene catalyst may include bridged fluorenyl, bridged indenyl metallocene, or any combination thereof. The propylene-comonomer block copolymer may be used as a heat seal layer for biaxially oriented multi-layer films.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.