Method for preparing a microporous film
    101.
    发明授权
    Method for preparing a microporous film 失效
    制备微孔膜的方法

    公开(公告)号:US5158636A

    公开(公告)日:1992-10-27

    申请号:US316005

    申请日:1989-02-27

    Abstract: A microporous, polymeric film is prepared by dissolving methylene-chloride-soluble, film-forming polymers completely in methylene chloride. Then an aqueous phase is prepared containing non-methylene-chloride-soluble, water-soluble thickeners and, if desired, additives, and brought to a viscosity of about 0.07 to 0.5 Pa s. The aqueous phase is then dispersed in the polymer solution and the resultant paste is spread onto a support material or intermediate support, the methylene chloride is evaporated, the resultant membrane is transferred to the actual support, and finally the water is removed by drying.

    Abstract translation: 通过将二氯甲烷可溶的成膜聚合物完全溶解在二氯甲烷中来制备微孔聚合物膜。 然后制备含有非二氯甲烷可溶性水溶性增稠剂和如果需要的添加剂并使粘度为约0.07至0.5Pa·s的水相。 然后将水相分散在聚合物溶液中,将所得糊状物涂布在载体材料或中间载体上,蒸发二氯甲烷,将所得膜转移至实际载体,最后通过干燥除去水分。

    Method of making high opacity resin porous films and aqueous latex for producing said films
    102.
    发明授权
    Method of making high opacity resin porous films and aqueous latex for producing said films 失效
    制造高透明树脂多孔薄膜和生产胶片的水性薄膜的方法

    公开(公告)号:US3817880A

    公开(公告)日:1974-06-18

    申请号:US27791872

    申请日:1972-08-04

    Applicant: DESOTO INC

    Inventor: KREIDER R

    Abstract: AN AQUEOUS LATEX COATING COMPOSITION ADAPTED TO DEPOSIT FILMS WHICH DRY TO FORM A CELLULAR LAYER OF HIGH OPACITY IS PROVIDED BY SWELLING THE RESIN PARTICULES OF THE AQUEOUS LATEX WITH A PRIMARY ORGANIC SOLVENT WHICH IS ESSENTIALLY IMMISICIBLE IN THE AQUEOUS PHASE OF THE LATEX SUCH AS XYLENE, AND BY INTRODUCING INTO THE AQUEOUS PHASE AN AT LEAST PARTIALLY WATER MISCIBLE ORGANIC SOLVENT, SUCH AS PROPYLENE GLYCOL, HAVING A LOWER EVAPORATION RATE AND A LESSER CAPACITY FOR SOLVATING THE RESIN OF THE LATEX THAN SAID PRIMARY SOLVENT. WHEN THE PRIMARY SOLVENT EVAPORATES, A CELLULAR FILM IS FORMED, THE SECONDARY SOLVENT SERVING TO INCREASE THE OPACIFICATION WHICH IS OBTAINED. PARTICULATE MATTER OR MATERIAL WHICH CRYSTALLIZES TO FORM PARTICULATE MATTER IS INCORPORATED INTO THE LATEX IN SMALL AMOUNT. THE PARTICULATE MATTER SERVES TO INCREASE ULTIMATE OPACITY AND ALSO TO GENERATE OPACITY MORE RAPIDLY WHEN A DEPOSITED FILM IS DRIED.

    Method for providing opaque,microcellular,film coatings on substrates and the resultant product
    104.
    发明授权
    Method for providing opaque,microcellular,film coatings on substrates and the resultant product 失效
    提供基底,微孔,薄膜和基材的薄膜涂层的方法

    公开(公告)号:US3669728A

    公开(公告)日:1972-06-13

    申请号:US3669728D

    申请日:1970-06-22

    Inventor: SEINER JEROME A

    Abstract: THE DISCLOSED INVENTION RELATES TO FILMS FROM A NOVEL LATEX MIXTURE WHICH ARE NON-POROUS, MICROCELLULAR AND OPAQUE IN THE ABSENCE OF AN OPACIFYING AGENT. THE PREPARATION OF THE FILMS OF THE DISCLOSED INVENTION COMPRISES PROVIDING CONTROL TECHNIQUES FOR ENTRAPPING A SUFFICIENT AMOUNT OF A LIQUID NON-SOLVENT FOR THE POLYMER IN THE POLYMER MATRIX OF A LATEX AFTER THE CONTINOUS PHASE REMOVAL, SO THAT UPON EVAPORATION OF THE NONSOLVENT FROM A COALESCED AND TACK-FREE POLYMER MATRIX, A RESULTING OPAQUE

    AND CONTINUOUS, NON-POROUS FILM IS PRODUCED WHICH WILL HAVE MINUTE, DISCRETE AND SUBSTANTIALLYCLOSED VOIDS AND WHICH IS OPAQUE IN THE ABSENCE OF AN OPACIFYING AGENT SUCH AS PIGMENT. THE DISCLOSED INVENTION ALSO RELATED TO OPAQUE FILMS WITH ENHANCED OPTICAL PROPERTIES PRODUCED BY THE INCLUSION OF PIGMENTS, FLORESCENT MATERIALS AND OPTICAL BRIGHTENERS IN THE OPAQUE FILMS IN SUCH A MANNER AS TO MAXIMIZE THEIR EFFECTIVENESS THEREIN.

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