Water-soluble packaging film

Patent metadata

Field	Value
Publication number	US-10351685-B2
Application number	US-201515509587-A
Country	US
Kind code	B2
Filing date	Aug 27, 2015
Priority date	Sep 17, 2014
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

The present invention provides a water-soluble packaging film which is capable of inhibiting roll contamination, which has favorable unwinding properties to pass through processing steps smoothly, thereby improving the productivity, and which has enhanced water solubility, chemical resistance, visibility, and packaging properties. The present invention relates to a water-soluble packaging film including: polyvinyl alcohol; a plasticizer; and starch, the starch being applied to a front surface and a rear surface of the water-soluble packaging film, the starch being applied in an amount of 0.001 to 0.10 g per 1 m2 of the water-soluble packaging film, the water-soluble packaging film having a contact angle with distilled water measured by the sessile-drop method of 20° to 50°.

First claim

The invention claimed is:

1. A water-soluble packaging film comprising:
polyvinyl alcohol;
a plasticizer; and
starch,
the starch being applied to a front surface and a rear surface of the water-soluble packaging film,
the starch being applied in an amount of 0.001 to 0.10 g per 1 m 2 of the water-soluble packaging film,
the water-soluble packaging film having a contact angle with distilled water measured by the sessile-drop method of 20° to 50°,
the polyvinyl alcohol being modified with a hydrophilic group,
the polyvinyl alcohol having a polymerization degree from 400 to 2000, and
the hydrophilic group being at least one selected from the group consisting of a sulfonic acid group and a pyrrolidone ring group.

2. The water-soluble packaging film according to claim 1 ,
wherein the polyvinyl alcohol has a saponification degree of 80 to 99.9 mol %.

3. The water-soluble packaging film according to claim 2 ,
wherein the polyvinyl alcohol has a standard deviation (a) of saponification degree distribution of 0.1 to 1.0 mol %.

4. The water-soluble packaging film according to claim 3 ,
wherein the polyvinyl alcohol in a 4% by weight aqueous solution has a viscosity measured at 20° C. of 5 to 35 mPa·s.

5. The water-soluble packaging film according to claim 4 ,
wherein the water-soluble packaging film has an orientation of 0.5 to 9.9 nm.

6. The water-soluble packaging film according to claim 3 ,
wherein the water-soluble packaging film has an orientation of 0.5 to 9.9 nm.

7. The water-soluble packaging film according to claim 2 ,
wherein the polyvinyl alcohol in a 4% by weight aqueous solution has a viscosity measured at 20° C. of 5 to 35 mPa·s.

8. The water-soluble packaging film according to claim 7 ,
wherein the water-soluble packaging film has an orientation of 0.5 to 9.9 nm.

9. The water-soluble packaging film according to claim 2 ,
wherein the water-soluble packaging film has an orientation of 0.5 to 9.9 nm.

10. The water-soluble packaging film according to claim 1 ,
wherein the polyvinyl alcohol has a standard deviation (a) of saponification degree distribution of 0.1 to 1.0 mol %.

11. The water-soluble packaging film according to claim 10 ,
wherein the polyvinyl alcohol in a 4% by weight aqueous solution has a viscosity measured at 20° C. of 5 to 35 mPa·s.

12. The water-soluble packaging film according to claim 11 ,
wherein the water-soluble packaging film has an orientation of 0.5 to 9.9 nm.

13. The water-soluble packaging film according to claim 10 ,
wherein the water-soluble packaging film has an orientation of 0.5 to 9.9 nm.

14. The water-soluble packaging film according to claim 1 ,
wherein the polyvinyl alcohol in a 4% by weight aqueous solution has a viscosity measured at 20° C. of 5 to 35 mPa·s.

15. The water-soluble packaging film according to claim 14 ,
wherein the water-soluble packaging film has an orientation of 0.5 to 9.9 nm.

16. The water-soluble packaging film according to claim 1 ,
wherein the water-soluble packaging film has an orientation of 0.5 to 9.9 nm.

Assignees

• Sekisui Chemical Co Ltd

Inventors

• Ieda Yasuyuki
• Moriguchi Shintaro

Classifications

• C09D103/02

  Starch; Degradation products thereof, e.g. dextrin · CPC title

• C08J2329/04

  Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids · CPC title

• B65D65/46

  Applications of disintegrable, dissolvable or edible materials · CPC title

• C08J2403/02

  Starch; Degradation products thereof, e.g. dextrin · CPC title

• B65D65/40

  Applications of laminates for particular packaging purposes {(B65D1/0215, B65D1/28, B65D3/22, B65D5/0281, B65D5/563, B65D9/30, B65D29/02, B65D31/02, B65D75/26, B65D77/2024, B65D81/1275, B65D81/3811, B65D81/3823, B65D81/3834, B65D81/3846, B65D81/3858, B65D81/3874, B65D81/3886, B65D81/3897 take precedence; laminates per se or laminated packages characterised by the composition or)} · CPC title