Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
A packaging shrink film consisting essentially of a random copolymer of propylene and an a-olefin having 4 or more carbon atoms or a random copolymer of propylene, an a-olefin having 4 or more carbon atoms and ethylene, said random copolymer satisfying the following conditions: (1) the content of an a-olefin having 4 or more carbon atoms in the copolymer is 8 to 30 mole %, (2) the content of ethylene in the copolymer is 3 mole % or less, (3) the content of a cold xylene-soluble portion in the copolymer is 15 to 60% by weight, and (4) the content of a boiling n-heptane-insoluble portion in the copolymer is 7% by weight or more, said film having been stretched.
Claim 2
Dependent Claim
119 words
A packaging shrink film consisting essentially of a random copolymer of propylene and an a-olefin having 4 or more carbon atoms or a random copolymer of propylene, an a-olefin having 4 or more carbon atoms and ethylene, said random copolymer satisfying the following conditions: (1) the content of an a-olefin having 4 or more carbon atoms in the copolymer is 8 to 30 mole %, (2) the content of ethylene in the copolymer is 3 mole % or less, (3) the content of a cold xylene-soluble portion in the copolymer is 15 to 60% by weight, and (4) the content of a boiling n-heptane-insoluble portion in the copolymer is 7% by weight or more, said film having been stretched.
Claim 3
Dependent Claim
27 words
A packaging shrink film according to Claim 1, wherein the copolymer is produced by the vapor phase polymerization in a state substantially free of any liquid medium.
Claim 4
Dependent Claim
25 words
A packaging shrink film according to Claim 1, which has Young's moduli in the machine and transverse directions of 3,000 to 9,000 kg/cm 2 .
Claim 5
Dependent Claim
25 words
A packaging shrink film according to Claim 2, which has Young's moduli in the machine and transverse directions of 5,000 to 8,000 kg/cm 2 .
Claim 6
Dependent Claim
19 words
A packaging shrink film according to Claim 1, wherein the a-olefin having 4 or more carbon atoms is butene-1.
Claim 7
Dependent Claim
19 words
A packaging shrink film according to Claim 2, wherein the a-olefin having 4 or more carbon atoms is butene-1.
Claim 8
Dependent Claim
19 words
A packaging shrink film according to Claim 3, wherein the a-olefin having 4 or more carbon atoms is butene-1.