| 摘要 |
<p>1,222,421. Paper. UNION CARBIDE CORP. 30 Jan., 1968 [31 Jan., 1967], No. 4784/68. Heading D2B. A fibrous web, e.g. of paper, is bonded with the product of curing a mixture comprising a cationic, water-soluble thermosetting resin and a water-soluble polyacrylamide resin. The thermosetting resin may be an epichlorohydrinpolyamide resin, a modified melamine-formaldehyde or a modified urea-formaldehyde resin. The polyacrylamide may be anionic or non-ionic. The mixture may be added to a fibrous pulp from which a paper sheet is sub-. sequently formed, or a preformed sheet of paper may be impregnated. In either case the sheet is heated to cure the resins. The bonded sheet may be subsequently coated and impregnated with cellulose xanthate and cellulose regenerated in situ to yield a material suitable for use as a casing for food products.</p> |
