Патент USA US2405658код для вставки
spans Patented Aug. 13, 1946 UNITED ' STATES PATENT OFFICE 2,405,658 MOLDING MATERIALS Henry Kremer, London, England No Drawing. Application April 8, 1943, Serial No. 482,320. In Great Britain May 29, 1942 2 Claims. (C1. 117-—72) 1 2 This invention consists in improvements in or 100 025. may be added to the blood prior to mix relating to molding materials and is an improve" ing. ment in or a modi?cation of the invention claimed In another example of this type of material urea formaldehyde resin (resin content 80 to 90%) with the appropriate hardener may be used instead of phenolic resin. In this case the mix ture should be molded without further drying. As an example of the type of material in which and described in the speci?cation of prior appli cation for United States Letters Patent Serial No. 397,331. . The invention claimed in the prior speci?ca tion comprised a dry composite molding material having an inactive ?ller the whole or substantially both the coating and/or impregnating materi the whole of the particles of which received a 10 .terials are synthetic resins, 15 lbs. of phenol. double coating and/or impregnation with two dif formaldehyde resin stage A is thoroughly mixed ferent materials each of which, when dry, will into 50 lbs. of sawdust or other inert ?ller so that substantially every grain is impregnated and/or constitute with the ?ller a moldable product. Such a dry composite material will be referred coated. This is then dried and is again impreg to in the ‘following description and appended 15 nated and/or coated with 15 lbs. of resorcinol formaldehyde resin and is then dried and molded 'claims as i‘a moldable material of the kind de ' scribed.” in the usual way. Both resins preferably have The improvement or modi?cation according to approximately 50 % solid resin content. When blood is described herein as being em the present invention comprises a moldable ma terial of the kind described in which one of the 20 ployed, it may be derived from any source or in coating and/or impregnating materials is a syn place of liquid blood, blood clots only or red cells thetic resin and the other material is either a dif of blood or any dried product of such materials may be utilised. In the case of dried products of ferent kind of synthetic resin or a solution con taining a protein material such as blood. blood such a material is preferably formed into When both coatings are synthetic resin ma 25 a dispersion or solution before use. I claim: terials they will be of two di?erent types both having different qualities and advantages. 11. A process for making a composite material In one example of the invention the ?rst ap moldable under heat and pressure which process comprises treating a particulate ?brous organici plied coating or impregnation contains blood as the protein material and the other coating may 30:?ller consisting of wood particles with su?icient‘ be a synthetic resin of any type such as phenol blood to provide substantially all of said individ aldehyde, cresol aldehyde, urea aldehyde, or res ual particles with a coating thereof, drying the ins of a synthetic rubber class. blood-coated particles, superposing on the coated one speci?c example of the invention 400 particles a coating of a water-soluble phenolic ozs‘Fof liquid blood is mixed with 13% ozs. of 35 formaldehyde resin and drying the coated par ammonium hydroxide (S. P. 0.92) after which ticles. 30 ozs. of paraformaldehyde, in the form of a 2; A process for making a compositematerial milk, is then thoroughly mixed in. To this blood moldable under heat and pressure which process mixture is now added 48 lbs. of sawdust or other comprises applying consecutively 'to substantially inert ?llers and the mixture dried, after which 40 all the individual particles of a particulate ?brous 10 lbs. of water-soluble phenol formaldehyde res organic ?ller two adherent and enveloping coat in, stage A, is mixed in so that every grain of ings one of which consists of a liquid comprising the mixture is thoroughly coated with the resin. blood and the other of a liquid comprising an The latter is now dried and the resultant mate uncured phenol-formaldehyde resin, each coat rial‘ is then ready for pressing or molding in ac 45 ing operation being followed by a drying opera cordance with the usual technique. Should the tion insu?icient to cure the coatings. sawdust be ?ne a small quantity of water, say HENRY KREMER.