GB2090603A
Expired / Lapsed
GB
⏱️ 0.0 years remaining
Water Soluble Films of Polyvinyl Alcohol and Polyacrylic Acid
Assignee: Colgate Palmolive Co
•
Filing: 1981-12-15
•
Granted: —
•
Expires: 2001-12-15
Abstract
Abstract Films which are clear, transparent, non-tacky, easily handleable, mechanically strong and stable at both low and high humidity conditions, and are rapidly soluble in cold and warm water are formed from blends of water soluble polyvinyl alcohol (partially hydrolyzed polyvinyl acetate) and polyacrylic acid, optionally with a plasticizer. The films are also heat sealable and biodegradable.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
GB
Data Source
google_patents
Last Synchronized
2026-10-23 01:52
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08L; C08L29/00; C08L29/02; C08L29/04; C08L33/00; C08L33/02; C11; C11D; C11D17/00; C11D17/04; C11D17/041; C11D17/042; C08J2329/00; C08J2329/02; C08J2329/04
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
18 words
An aqueous polymer solution castable to film from comprising a partially hydrolysed polyvinyl acetate and a polyacrylic acid.
Claim 2
Dependent Claim
18 words
An aqueous polymer solution castable to film from comprising a partially hydrolysed polyvinyl acetate and a polyacrylic acid.
Claim 3
Dependent Claim
38 words
An aqueous polymer solution as claimed in Claim 1 in which the polyvinyl acetate has a degree of hydrolysis less than 96% and more than 79% and a weight average molecular weight in the range 10,000 to 50,000.
Claim 4
Dependent Claim
32 words
An aqueous polymer solution as claimed in Claim 2, in which the degree of hydrolysis is in the range 85% to 95% and the molecular weight in the range 20,000 to 40,000.
Claim 5
Dependent Claim
33 words
An aqueous polymer solution as claimed in Claim 2 in which the degree of hydrolysis is in the range 85% to 90% and the molecular weight is in the range 22,000 to 31,000.
Claim 6
Dependent Claim
31 words
An aqueous polymer solution as claimed in any one of claims 1 to 4 in which the polyacrylic acid had a weight average molecular weight in the range 30,000 to 400,000.
Claim 7
Dependent Claim
21 words
An aqueous polymer solution as claimed in Claim 5 in which the molecular weight is in the range 50,000 to 300,000.
Claim 8
Dependent Claim
32 words
An aqueous polymer solution as claimed in any one of the preceding claims in which the total concentration of hydrolyzed polyvinyl acetate and polyacrylic acid is in the range 5% to 30%.
Claim 9
Dependent Claim
18 words
An aqueous polymer solution as claimed in Claim 7 in which the concentration is in the range 8%to20%.
Claim 10
Dependent Claim
38 words
An aqueous polymer solution as claimed in any one of the preceeding claims in which the weight ratio of partially hydrolysed polyvinyl acetate to polyacrylic acid (on a dry weight basis) is in the range 10:1 to 1:1.
Claim 11
Dependent Claim
31 words
An aqueous polymer solution as claimed in any one of the preceding claims containing 0.5 to 5% by weight of the solution of a plasticizer for the partially hydrolyzed polyvinyl acetate.
Claim 12
Dependent Claim
34 words
An aqueous polymer solution as claimed in any one of claims 1 to 10 containing up to 0.1% of biocide, non-toxic to humans, based on the dry weight of the partially hydrolyzed polyvinyl acetate.
Claim 13
Dependent Claim
22 words
An aqueous polymer solution as claimed in Claim 1 substantially as specifically described herein with reference to Example 1 or Example 2.
Claim 14
Dependent Claim
56 words
1 3. A process for making a water soluble plastics film which comprises casting a continuous layer or film of an aqueous polymer solution as claimed in any one of claims 1 to 12 on a temporary support removing the water therefrom to produce a continuous polymer film and stripping the film from the temporary support.
Claim 15
Dependent Claim
21 words
A process as claimed in Claim 1 3 substantially as specifically described herein with reference to Examples 1 or Example 2.
Claim 16
Dependent Claim
20 words
1 5. A water soluble polymer film whenever made by a process as claimed in Claim 13 or Claim 14.
Claim 17
Dependent Claim
18 words
1 6. A water soluble film comprising a uniform mixture of water soluble polyvinyl alcohol and polyacrylic acid.
Claim 18
Dependent Claim
18 words
1 6. A water soluble film comprising a uniform mixture of water soluble polyvinyl alcohol and polyacrylic acid.
Claim 19
Dependent Claim
31 words
1 7. A water soluble film as claimed in Claim 16 in which the weight ratio of polyvinyl alcohol to polyacrylic acid is in the range of from 10:1 to 1:1.
Claim 20
Dependent Claim
17 words
A water soluble film as claimed in Claim 17 in which the weight ratio is about 4:1.
Claim 21
Dependent Claim
61 words
A water soluble film as claimed in Claim 1 7 or 1 8 in which the polyvinyl alcohol has a degree of hydrolysis in the range of from 85% to 90% and a weight average molecular weight in the range of from 10,000 to 50,000 and the polyacrylic acid has a molecular weight in the range of from 30,000 to 400.000.
Claim 22
Dependent Claim
61 words
A water soluble film as claimed in Claim 16, 17, 18 or 19 in which the polyvinyl alcohol has a degree of hydrolysis in the range of from 86 to 89% and a weight average molecular weight in the range of from 22,000 to 31,000 and the polyacrylic acid has a molecular weight in the range of from 100,000 to 200,000.
Claim 23
Dependent Claim
25 words
A water soluble film as claimed in any one of the Claims 16 to 20 which further comprises a plasticizer for the polyvinyl alcohol component.
Claim 24
Dependent Claim
19 words
A water soluble film as claimed in Claim 21 in which the plasticizer is tetraethylene glycol or polyglycerol. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.