Water-resistant polyvinyl alcohol film and its application to the preparation of gas-impermeable composite articles
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B32B-027/06
B32B-027/30
B29C-045/14
출원번호
US-0751491
(1985-07-03)
우선권정보
FR-0011119 (1981-06-03); FR-0020119 (1982-12-01)
발명자
/ 주소
Bonnebat Claude (Pontault-Combault FRX) Macabrey Louis (Mitry-le-Neuf FRX) Roullet Gilbert (Clamecy FRX)
출원인 / 주소
Rhone-Poulenc, S.A. (Courbevoie FRX 03)
인용정보
피인용 횟수 :
22인용 특허 :
0
초록▼
Polyvinyl alcohol films are provided which are gelled, non-tacky, bubble-free and resistant to water at ambient temperatures. The polyvinyl alcohol film is obtained by plasticizing (fluxing) and melting granules of pure polyvinyl alcohol containing from 25 to 35% by weight of water at a temperature
Polyvinyl alcohol films are provided which are gelled, non-tacky, bubble-free and resistant to water at ambient temperatures. The polyvinyl alcohol film is obtained by plasticizing (fluxing) and melting granules of pure polyvinyl alcohol containing from 25 to 35% by weight of water at a temperature at least 100°C. above the equilibrium melting point of the granules and less than or equal to 220°C., and extruding the melted granules through a die at a temperature at least 5°C. above the equilibrium melting point of the granules and less than or equal to 98°C., optionally followed by monoaxial stretching or biaxial stretching of the unstretched film obtained. The stretched or unstretched film may be heat-treated to improve its properties. The polyvinyl alcohol film can be used to prepare with thermoplastic films composite films or sheets having a high gas impermeability. The invention also provides composite, biaxially oriented, impermeable barrier layer coated, thermoplastic hollow shaped articles useful as packaging material, e.g., as packages and bottles for flavored foods and carbonated beverages. The hollow shaped articles are produced by externally barrier covering a thermoplastic tubular blank, parison or preform with a relativley thick barrier layer consisting essentially of water-resistant and highly crystalline polyvinyl alcohol, said barrier layer having been prepared by shaping a melt of homogeneously shear fluxed and molten flakes of pure polyvinyl alcohol having a water content of 25 to 35% by weight thereof, with said shear fluxing and melting of said polyvinyl alcohol flakes being at a temperature above the equilibrium melting point of the polyvinyl alcohol/water admixture essentially constituting said flakes, and said shaping being at a temperature of at least said equilibrium melting point but less then that at which the vapor pressure of the component water would effect the surface expansion and bubbling of the desired barrier layer, and then biaxially orienting and blow molding into final configuration said barrier covered blank, parison or preform.
대표청구항▼
A composite thermoplastic article comprising a gelled, non-tacky, buffle-free film which is composed of polyvinyl alcohol and which is resistant to water at ambient temperature adhered to a thermoplastic material. A composite thermoplastic article comprising a gelled, non-tacky, bubble-free film whi
A composite thermoplastic article comprising a gelled, non-tacky, buffle-free film which is composed of polyvinyl alcohol and which is resistant to water at ambient temperature adhered to a thermoplastic material. A composite thermoplastic article comprising a gelled, non-tacky, bubble-free film which is composed of polyvinyl alcohol and which is resistant to water at ambient temperature adhered to a thermoplastic material, wherein said polyvinyl alcohol film is obtained by fluxing and melting granules of polyvinyl alcohol, said granules containing from aabout 25% to about 35%, by weight, of water, at a temperature above the equilibrium melting point of the polyvinyl alcohol/water mixture forming said granules; and extruding the melted granules through a die at a temperature above the equilibrium melting point of the polyvinyl alcohol/water mixture, but below the temperature at which the water vapor pressure would be sufficient to cause the formation ob bubbles when the material is exposed to the air.
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