GB609927A - Improvements in or relating to the production of heat-sealable, transparent, cellulosic sheets and films - Google Patents
Improvements in or relating to the production of heat-sealable, transparent, cellulosic sheets and filmsInfo
- Publication number
- GB609927A GB609927A GB9213/46A GB921346A GB609927A GB 609927 A GB609927 A GB 609927A GB 9213/46 A GB9213/46 A GB 9213/46A GB 921346 A GB921346 A GB 921346A GB 609927 A GB609927 A GB 609927A
- Authority
- GB
- United Kingdom
- Prior art keywords
- film
- per cent
- polyvinyl alcohol
- heat
- polyvinyl
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/0427—Coating with only one layer of a composition containing a polymer binder
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/046—Forming abrasion-resistant coatings; Forming surface-hardening coatings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/048—Forming gas barrier coatings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/052—Forming heat-sealable coatings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2427/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2427/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2427/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08J2427/06—Homopolymers or copolymers of vinyl chloride
Abstract
A heat-sealable transparent cellulosic film comprises a transparent, smooth substantially non-porous, non-fibrous, water-sensitive cellulosic sheet having incorporated therein a polyvinyl alcohol, the said polyvinyl alcohol being a hydroxylated polyvinyl product containing in addition, ester, ether, acetal or ketal groups, the numerical hydroxyl content being between 70 and 96 per cent and being sufficiently large to render the said product soluble in water. The polyvinyl alcohol of the type described may thus be a partially hydrolysed ester such as the acetate, propionate, lactate, etc.; a partially hydrolysed ether such as the methyl, ethyl, glycollic acid ethers etc.; a partially hydrolysed acetal such as the formal, acetal, butyral, glyoxal, etc.; or a partially hydrolysed ketal such as is derived from acetone, methyl ethyl ketone, or diethyl ketone. Co-polymers such as those of polyvinyl acetate or other ester with polyvinyl chloride, methacrylic acid or ethylene may also be hydrolysed. The films or sheets which are rendered heat-sealable are primarily those of regenerated cellulose, but other materials such as lowly substituted cellulose ethers, e.g. glycol-, methyl-, ethyl-cellulose and cellulose glycollic acid may be used. The polyvinyl alcohol of the type described is incorporated in the cellulosic sheet to an extent between 0.1 and 1.0 per cent based on the weight of the air-dry finished sheet. The incorporation is effected by passage of the film, preferably in the gel state, through a bath containing an aqueous dispersion of the polyvinyl alcohol, which may contain in addition softening agents for the sheet or film, hardening agents for the polyvinyl alcohol and a water-soluble condensing agent to be used in conjunction with the hardening agent. Hardening agents include condensable and polymerisable water-soluble thermosetting resins such as urea-formaldehyde, phenol-aldehyde, melamine-aldehyde and the like and such compounds as chromic nitrate, chromic acetate, and boric acid. The treated sheet is passed through squeeze rollers or the like to remove excess dispersion and dried for example by passage over heated rollers. The film may be coated as a base with a heat-sealing surface coating or with a moisture-proof, heat-sealable, surface coating (see Group VIII). In an example a gel regenerated cellulose film prepared from viscose by known methods is passed through a bath containing an aqueous dispersion comprising 11 per cent glycerol and 1 per cent of a polyvinyl alcohol prepared by partial hydrolysis of polyvinyl acetate until the numerical content of hydroxyl groups is 80 per cent and the saponification number is 150. The film is passed through squeeze rolls and dried by contact with heated rollers at 60 DEG -90 DEG C. In a further example a similar film from viscose is impregnated with a dispersion as in the previous example containing in addition 0.5 per cent of condensable water-soluble urea-formaldehyde of the kind sold under the Registered Trade Mark "Uformite 414" and 0.05 per cent of maleic acid, and dried in the usual way. The film of this example is coated in a further example in two stages, the first being the application of a sub-coating comprising partly condensed urea-formaldehyde-isobutanol resin, para-toluene sulphonic acid and high viscosity nitro-cellulose dissolved in a mixture of isobutanol, ethyl acetate and toluene, and the second a coating comprising nitrocellulose, dewaxed dammar, dibutyl phthalate, dicylohexyl phthalate, an aryl sulphonamide formaldehyde resin and paraffin wax dissolved in a mixture of ethyl alcohol, ethyl acetate and toluene. Tests for moisture proofing and for measuring the heat-seal bond strength are described. Specifications 446,383, 545,523, 552,527 and 560,715 are referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US609927XA | 1945-03-27 | 1945-03-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB609927A true GB609927A (en) | 1948-10-08 |
Family
ID=22032985
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9213/46A Expired GB609927A (en) | 1945-03-27 | 1946-03-25 | Improvements in or relating to the production of heat-sealable, transparent, cellulosic sheets and films |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB609927A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2273458A (en) * | 1992-12-18 | 1994-06-22 | China Int Ass Science & Tech | Vegetable cellulose films |
-
1946
- 1946-03-25 GB GB9213/46A patent/GB609927A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2273458A (en) * | 1992-12-18 | 1994-06-22 | China Int Ass Science & Tech | Vegetable cellulose films |
AU677243B2 (en) * | 1992-12-18 | 1997-04-17 | China International Association For Promotion Of Science & Technology | Plant cellulose film products and process of preparing the same |
GB2273458B (en) * | 1992-12-18 | 1997-06-04 | China Int Ass Science & Tech | Vegetable cellulose films |
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