Claims
- 1. A statistical propylene copolymer comprising:
- 0.2-0.9% by weight monomeric units derived from ethylene;
- 13-21% by weight monomeric units derived from 1-butene;
- 78.1-86.8% by weight monomeric units derived from propylene, said copolymer having:
- a melting point of 115-125.degree. C.;
- a proportion of polymer soluble in boiling heptane greater than or equal to 95% by weight; and
- a proportion of polymer soluble in cold xylene (25.degree. C.) greater than 40% by weight.
- 2. The copolymer according to claim 1, wherein the content of monomeric units derived from ethylene is 0.4-0.8% by weight.
- 3. The copolymer according to claim 1, wherein the content of monomeric units derived from butene is 15-19% by weight.
- 4. The copolymer according to claim 1, having a sealing temperature of 100-106.degree. C.
- 5. The copolymer according to claim 1, having a proportion of polymer soluble in boiling heptane greater than or equal to 97% by weight.
- 6. The copolymer of claim 1 which is a statistical propylene copolymer comprising:
- 0.2 to 0.9% by weight monomeric units derived from ethylene;
- 13 to 21% by weight monomeric units derived from 1-butene;
- 78.1 to 86.8% by weight monomeric units derived from propylene, said copolymer having:
- a melting point of 115 to 125.degree. C.;
- a proportion of polymer soluble in boiling heptane greater than or equal to 95% by weight;
- a proportion of polymer soluble in cold xylene (25.degree. C.) greater than 40% by weight;
- a melt fluidity index of 4 to 10 g/10 min.; and
- a sealing temperature of 100 to 106.degree. C.
- 7. The copolymer of claim 1, which is a statistical propylene copolymer comprising:
- 0.4 to 0.8% by weight monomeric units derived from ethylene;
- 15 to 19% by weight monomeric units derived from 1-butene;
- 84.6 to 80.3% by weight monomeric units derived from propylene, said copolymer having:
- a melting point of 115 to 125.degree. C.;
- a proportion of polymer soluble in boiling heptane greater than or equal to 95% by weight; and
- a proportion of polymer soluble in cold xylene (25.degree. C.) greater than 40% by weight;
- a melt fluidity index of 4 to 10 g/10 min.; and
- a sealing temperature of 100 to 106.degree. C.
Priority Claims (1)
Number |
Date |
Country |
Kind |
MI94A0922 |
May 1994 |
ITX |
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CROSS-REFERENCE TO RELATED APPLICATION
This application is a Continuation of application Ser. No. 08/437,714, filed May 9, 1995, now abandoned.
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0145014 |
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Translations of Japanese 63-95208 and 63-95209. |
Continuations (1)
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Number |
Date |
Country |
Parent |
437714 |
May 1995 |
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