Claims
- 1. A stretch film comprising a resin composition composed of
- (A) a resin selected from the group consisting of (i) an ethylene-vinyl acetate copolymer resin having a vinyl acetate content of from about 5 to 25% by weight and (ii) a polybutadiene resin,
- (B) a binder, and
- (C) a lubricant, wherein the strecth film has a surface structure such that particles of binder (B) are scattered on the surface of the film layer composed of resin (A) containing residual amounts of binder (B) and lubricant (C) which do not migrate to the surface and the surface of the film layer and the entire surface of the particles of binder (B) are covered by lubricant (C) to form convex protubernances having a diameter of from 0.1 to 5.mu. and wherein the stretch film has a static friction coefficient of not more than 0.55 and an adhesive strength of not less than 200 g/2 cm.sup.2.
- 2. The stretch film as in claim 1, which is prepared by an inflation method with a blow ratio of from about 3 to 7.
- 3. The stretch film as in claim 1, which has a thickness of from about 10 to 100.mu..
- 4. The stretch film as in claim 1, as a pre-package film which has a thickness of from about 13 to 25.mu..
- 5. The stretch film as in claim 1, wherein each convex protuberance has a height of from about 0.05 to 0.5.mu..
- 6. The stretch film as in claim 1, wherein the convex protuberances are substantially spherical convex protuberances.
- 7. The stretch film as in claim 1, wherein the polybutadiene is 1,2-polybutadiene.
- 8. The stretch film as in claim 1, wherein the binder is a fatty acid ester selected from the group consisting of sorbitan oleate and sorbitan laurate.
- 9. The stretch film as in claim 1, wherein the lubricant is a fatty acid ester selected from the group consisting of monoglycerin oleate, polyglycerin oleate, glyceryl triricinoleate and glyceryl acetyl ricinoleate.
- 10. The stretch film as in claim 1, which comprises from 90 to 99.6% of resin (A), from about 0.2 to 5 wt% of binder (B) and from about 0.2 to 5 wt% of lubricant (C), with the amount of binder (B) not exceeding the amount of lubricant (C).
- 11. The stretch film as in claim 10, wherein the weight ratio of (B):(C) is from about 0.8:1 to 0.2:1.
- 12. The stretch film as in claim 7, wherein the 1,2-polybutadiene has a melt flow index of from about 1 to 8 and a density of from about 0.890 g/cm.sup.3 to 0.915 g/cm.sup.2.
- 13. The stretch film as in claim 1, wherein the vinyl acetate content is from about 10 to 20 wt%.
Priority Claims (1)
Number |
Date |
Country |
Kind |
54-49801 |
Apr 1979 |
JPX |
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CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation of Ser. No. 143,260, filed Apr. 24, 1980, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4066811 |
Naito et al. |
Jan 1978 |
|
4168354 |
Watts |
Sep 1979 |
|
Continuations (1)
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Number |
Date |
Country |
Parent |
143260 |
Apr 1980 |
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