Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB472641A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HANS LEO LEHMANN
Original Assignee
HANS LEO LEHMANN
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HANS LEO LEHMANNfiledCriticalHANS LEO LEHMANN
Priority to GB472641ApriorityCriticalpatent/GB544771A/en
Publication of GB544771ApublicationCriticalpatent/GB544771A/en
C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
Abstract
544,771. Fibrous compositions; compound sheet materials. LEHMANN, H. L., and SONDHEIMER, M. April 9, 1941, No. 4726. [Class 70] [Also in Group VIII] Wood waste, preferably a mixture of particles of wood shavings and sawdust is mixed with dry powdered or crushed animal glue, and then with water sufficient to swell the glue but not more than to make an extremely thick solution. The mixture is submitted to pressure and heat (90 1b. per square inch and 150‹ F.) preferably between sheets of veneer, paper or metal. The product is rendered waterproof by incorporating in the mixture formaldehyde or its polymers or substances which develop formaldehyde on heating, e.g. hexamin.
GB472641A1941-04-091941-04-09Method for the utilization of wood waste
ExpiredGB544771A
(en)