| 摘要 |
<p>In making laminated glass, a sheet of glass is first coated with adhesive and a solution containing a cellulose derivative is applied over the adhesive coating, after which the solvent is evaporated and a further sheet of glass is secured by adhesive to the cellulosic layer. The adhesive may be an aqueous or other solution of gelatine or synthetic resin such as polymerized vinyl acetate, or soluble phenol aldehyde resins, diphenylol propane-formaldehyde resins, diphenylol-propane-ketone resins, toluene sulphonamide-aldehyde resins, benzene-sulphonamide-aldehyde resins, xylene-sulphonamide-aldehyde resins or lactic acid resins. The adhesive may also contain cellulose derivatives and plasticizers. The cellulose derivatives are preferably prepared by filtration or are subjected in the solid form to oxidizing agents as described in Specifications 341,890 and 347,257, [both in Group VIII]. The cellulose layer may be formed by a single application of solution or by a number of applications the various coatings being dried to the required extent before the next coating is applied. A suitable solution for building up a reinforcing layer on adhesive-coated glass consists of cellulose acetate, propionate, or butyrate, 20 parts by weight, acetone 100 parts. A second such solution giving parts by weight comprises cellulose acetate or nitrate 20 parts, triacetin 10 parts, acetone 100 parts. A third solution consists of cellulose acetate 25 parts, triacetin 5 parts, diethyl phthalate 5 parts, acetone 80 parts, benzene 10 parts, ethyl acetate 10 parts, diacetone alcohol 5 parts. The following example gives an adhesive solution which may be employed to cause a reinforcing layer of cellulose acetate to adhere to glass; cellulose acetate 2 parts, synthetic resin 3 parts, triacetin 2 parts, acetone 50 parts, alcohol 25 parts, benzene 25 parts, ethyl lactate 5 parts. The synthetic resin may be toluene sulphonamide formaldehyde resin, a diphenylol propane-formaldehyde resin or other synthetic resin.</p> |
