Claims
- 1. A composite material comprising a substrate which is not or very slightly excitable by microwaves and an adherent coating on at least a portion of said substrate based on polymeric composition containing at least 50% by weight of a polymer excitable by microwaves, wherein the melting point of the substrate is lower than the film-formation temperature of the polymeric composition and said coating is adhered to said substrate by utilizing only electromagnetic radiation in the microwave region.
- 2. The composite material of claim 1, wherein the thickness of the coating is lower than or equal to about 300 .mu.m.
- 3. The composite material of claim 2, wherein the substrate is based on at least one perhalogenated or non-perhalogenated polyolefin.
- 4. The composite material of claim 3, wherein the polyolefin is a polyethylene, polypropylene, polytetrafluoroethylene, or mixtures thereof, and the thickness of the coating is less than about 100 .mu.m.
- 5. The composite material according to any one of claims 1 to 4, wherein the polymeric composition comprises:
- (a) homo- or copolymers of the monomers of the esters of acrylic and methylacrylic acid, fumaric and maleic acids, or vinyl esters, acrylamides, aminomethacrylates, or hydroxyacrylates, Nmethylolacrylamides, acrylic and methacrylic acids, vinyl or vinylidene halides, or alkyl or vinyl esters,
- (b) copolymers of vinylidene fluoride and of one or more perfluorinated or chlorofluorinated comonomers,
- (c) polyamides, and/or
- (d) polyetheramides.
- 6. The composite material according to any one of claims 1 to 4, characterized in that the polymeric composition contains polyvinylidene fluoride.
- 7. A process for the manufacture of composite material comprising a substrate which is not or very slightly excitable by microwaves and an adherent film on at least a portion of said substrate based on a polymeric composition containing at least 50% by weight of a polymer excitable by microwaves; the melting point of the substrate being lower than the film-forming temperature of the polymeric composition, the process comprising coating at least a portion of said substrate with said polymeric composition and forming said polymeric composition into a film by subjecting the coated substrate only to electromagnetic radiation in the microwave region which releases stationary waves for a time sufficient to convert said coating into a film adhering to said substrate.
- 8. The process of claim 7, wherein the polymeric composition is applied onto the substrate in pulverulent form.
- 9. The process of claim 7, wherein the polymeric composition is applied onto the substrate in liquid form.
- 10. The process of any one of claims 7, 8, or 9, wherein the coated substrate is kept in motion while being subjected to the electromagnetic radiation to ensure that the energy received by the coating is substantially uniform over the entire coating during the period of exposure to the electromagnetic radiation.
Priority Claims (1)
Number |
Date |
Country |
Kind |
89 04260 |
Mar 1989 |
FRX |
|
Parent Case Info
This application is a continuation of application Ser. No. 502,263 filed Mar. 30, 1990, now abandoned.
Foreign Referenced Citations (2)
Number |
Date |
Country |
WO8501294 |
Mar 1985 |
EPX |
2051660 |
Jan 1981 |
GBX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
502263 |
Mar 1990 |
|