Abstract A process for the production of plane three-ply materials for plane building components, which materials consist of a relatively thick inner ply of a thermoplastic and relatively thin outer plies of another thermoplastic. The process comprises preparing a board of polyethylene by means of a screw extruder at elevated temperature and covering the board on both sides with a film of a terpolymer at elevated temperature by means of a pair of rollers to form a sandwich assembly. The terpolymer must have a specific chemical composition; it is prepared from (1) a predominant amount of ethylene, (2) a relatively low amount of an ethylenically unsaturated carboxylic acid and (3) a relatively low amount of an ester of an ethylenically unsaturated carboxylic acid.
Inventors
👤 Heinz Mueller-Tamm
👤 Hans Frielingsdorf
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-01 11:43
CPC Classifications
B; B32; B32B; B32B27/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
92 words
A process as claimed in claim 1 wherein a film of a terpolymer consisting of 71 to 90 parts by weight of ethylene units, 3 to 9 parts by weight of units of an aliphatic ethylenically unsaturated carboxylic acid having three to five carbon atoms and 1 to 20 parts by weight of units of an alkyl ester having one to eight carbon atoms in the alkyl group of aliphatic ethylenically unsaturated carboxylic acid having three to five carbon atoms, the sum of the parts by weight amounting to 100, is used.
Claim 2
Dependent Claim
62 words
A process as claimed in claim 1 wherein a film of a terpolymer is used which contains 71 to 90 parts by weight of ethylene units, 3 to 9 parts by weight of acrylic acid units and 1 to 20 parts by weight of units of the tertiary-butyl ester of acrylic acid, the sum of the parts by weight amounting to 100.
Claim 3
Dependent Claim
38 words
A process as claimed in claim 1 wherein the terpolymer has the following physical data: density: 0.9 to 1.1 g./cm.3; crystalline fraction: less than 60 percent; melting range: 70* to 120* C.; Shore hardness C: 50 to 90.