Propylene copolymers
AssigneeMitsubishi Petrochemical Co., Ltd.
InventorsMasaki Fujii, Mitsutaka Miyabayashi
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Abstract
A copolymer of propylene and a straight-chain .alpha.-olefin of 5 to 12 carbon atoms is characterized in that: its intrinsic viscosity is 0.3 to 15 dl./g. (at 135.degree. C., in decalin); it contains 3 to 30 percent by weight of the .alpha.-olefin; and when it is subjected to successive extraction with o-dichlorobenzene at 40.degree. C. and 80.degree. C., the quantities, fusion peak temperatures, and content of the .alpha.-olefin of the resulting fractions are respectively within specific limits of values. A preferred copolymer contains about 0.5 to 50 percent of a propylene homopolymer block and about 99.5 to 50 percent of a random copolymer block of propylene and a straight chain .alpha.-olefin having 5 to 12 carbon atoms.
Claims10
A copolymer of propylene and a straight-chain .alpha.-olefin having 6 carbon atoms, characterized in that:
- (1) the limiting viscosity thereof is 0.3 to 15 dl/gram (at 135.degree. C., in decalin);
- (2) the content of the straight-chain .alpha.-olefin having 6 carbon atoms therein is 5 to 20 percent by weight;
- and
- (3) the quantity, the fusion peak temperature as determined by differential scanning calorimetry (DSC), and the content of the straight-chain .alpha.-olefin of each of the fractions resulting from successive extraction of the copolymer at 40.degree. C. and 80.degree. C. by means of o-dichlorobenzene are as indicated in the table:
- ______________________________________ Definitive quantities:
- Content of Fusion straight- Quantity peak chain .alpha.- (% by temp. by olefin (% Fraction weight) DSC (.degree.C.) by weight) ______________________________________ Substanti- Fraction soluble ally no at or below 40.degree. C. 1 to 45 peaks reco- 10 to 60 gnizable Fraction soluble at or above 40.degree. C. and at or below 10 to 74 80 to 135 3 to 17 80.degree. C. Fraction insolu- ble at or below 25 to 75 135 to 160 1 to 11 80.degree. C. ______________________________________
A block copolymer of propylene and a straight-chain .alpha.-olefin having 5 to 12 carbon atoms, characterized in that:
- (1) the block copolymer consists essentially of (a) about 0.05 to 50 percent of a propylene homopolymer block and (b) about 99.5 to 50 percent of a random copolymer block of propylene and a straight-chain .alpha.-olefin having 5 to 12 carbon atoms.
- (2) the intrinsic viscosity of the block copolymer is 0.3 to 15 dl/g (in decalin, at 135.degree. C.).
Dependencies are inferred from the claim text.