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Thermoplastic olefin resin composition and laminated film or sheet thereof
| Details |
Inventors: Matsuda, Akira; Tojo, Tetsuo; Iwata, Kazuo;
Assignee: Mitsui Petrochemical Industries Ltd. (Tokyo, JP)
Primary Examiner: Seccuro; Carman J.
Assistant Examiner:
Attorney, Agent or Firm: Sherman & Shalloway
A thermoplastic olefin resin composition composed of a blend of (i) 5 to 95% by weight, based on the weight of the blend, of a random copolymer consisting essentially of 55 to 85 mole % of propylene and 45 to 15 mole % of 1-butene and having a heat of fusion of 10 to 80 joules/g determined by differential thermal analysis using a differential scanning calorimeter, and (ii) 5 to 95% by weight, based on the weight of the blend, of an isotactic propylene resin containing 0 to 10 mole % of another .alpha.-olefin and having a melting point of 135.degree. to 165.degree. C. and a melt index, measured at 230.degree. C., of 0.1 to 20; and a laminated olefin resin film or sheet thereof. |
|
DETAILED DESCRIPTION What we claim is: 1.
A thermoplastic olefin resin composition composed of a blend of (i) 5 to 95% by weight, based on the weight of the blend, of a random copolymer consisting essentially of 55 to 85 mole% of propylene and 45 to 15 mole% of 1-butene and having a heat of fusion of 10 to 80 joules/g determined by differential thermal analysis using a differential scanning calorimeter, and (ii) 5 to 95% by weight, based on the weight of the blend, of an isotactic propylene resin containing 0 to 10 mole% of another .
alpha.
-olefin and having a melting point of 135.
degree.
to 165.
degree.
C.
and a melt index, measured at 230.
degree.
C.
, of 0.
1 to 20.
2.
The composition of claim 1 wherein the random copolymer has a melt index of 0.
1 to 40.
3.
The composition of claim 1 wherein the random copolymer has a propylene content of 60 to 82 mole%.
4.
The composition of claim 1 wherein the random copolymer has a heat of fusion of 20 to 70 joules/g.
5.
The composition of claim 1 which is in the form of a melt-shaped article.
Description:
This invention relates to a thermoplastic olefin resin composition composed of a blend of (i) a random copolymer consisting essentially of propylene and 1-butene and (ii) an isotactic propylene resin having a melting point of 135.
degree.
to 165.
degree.
C.
and a melt index (at 230.
degree.
C.
) of 0.
1 to 20.
The invention also relates to a laminated film or sheet having a laminated layer of the thermoplastic olefin resin composition.
It further relates to the thermoplastic olefin resin composition in the form of a melt-shaped article.
When the resin composition of this invention comprises a major proportion of the random copolymer (i) of propylene and 1-butene, it has markedly improved anti-blocking property and mechanical strength in addition to various other desirable properties such as superior transparency, superior low-temperature heat sealability and good low temperature shrinkability.
Because of these improved properties, this resin composition is very useful as melt-shaped articles such as shrinkable packaging films or sheets, protective films or sheets, textile packaging films or sheets, and other general-purpose packaging films
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Adhesives and Rubbers 
