Claims
- 1. Process for the preparation of permanently embossed, highly porous wallpaper, which process comprises:
- (1) preparing a sheet from a mixture comprising up to 90% by weight of cellulose fibers and at least 10% by weight of fibrils of at least one thermoplastic polymer, said fibrils having a surface area greater than 1 m.sup.2 /g, and
- (2) subjecting the sheet to the following operations (a) and (b), in whatever sequence:
- (a) embossing the sheet while the sheet is at a temperature lower than the softening temperature of said thermoplastic polymer,
- (b) heating the sheet while the sheet is at a temperature equal to or higher than the softening temperature of said thermoplastic polymer, for a time sufficient to melt at least a part of the fibrils incorporated in the sheet.
- 2. The process of claim 1, in which the heating is carried out at a temperature at least 5.degree. C. higher than the melting temperature of the thermoplastic polymer.
- 3. The process of claim 1 in which the sheet is embossed while the sheet is at about room temperature.
- 4. The process of claim 1 in which the sheet which is embossed has a moisture content of from 2% to 10% by weight based on the total weight of the sheet.
Priority Claims (2)
Number |
Date |
Country |
Kind |
24557 A/76 |
Jun 1976 |
ITX |
|
26334 A/76 |
Aug 1976 |
ITX |
|
Parent Case Info
This is a Div. of application Ser. No. 808,570, filed June 21, 1977, now abandoned.
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2102641 |
Apr 1972 |
FRX |
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Dec 1974 |
JPX |
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GBX |
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GBX |
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Feb 1972 |
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GBX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
808570 |
Jun 1977 |
|