C - Chemistry – Metallurgy – 09 – J
Patent
C - Chemistry, Metallurgy
09
J
C09J 5/02 (2006.01) B29C 65/50 (2006.01) C09J 5/10 (2006.01) C08L 75/04 (2006.01)
Patent
CA 2355961
A means for joining thermoplastic sheets to each other at a seam defined by adjacent edges of the thermoplastic sheets by a bond that is accomplished within a short time, measured in minutes, and at 40 degrees Fahrenheit or lower. Surface portions extending from adjacent edges the thermoplastic sheets are impregnated with a resin having hydroxyl groups available for chemical covalent bonding. A polyurethane having an excess isocyanate component is then disposed between impregnated surface portions of the thermoplastic sheets such that covalent bonds are formed between the hydroxyl groups and isocyanate. The invention also contemplates sealing seams between adjacent thermoplastic sheets by impregnating a thermoplastic strip with a resin having hyrdroxyl groups and disposing the polyurethane having an excess isocyanate component between the strip and thermoplastic sheets such that covalent bonds are formed between the hydroxyl groups and isocyanate.
Cette invention se rapporte à des feuilles en matériau thermoplastique qui servent à garnir intérieurement des cuves et des conduits structurels et dont des parties des surfaces dans les bords devant être jointes après traitement à l'uréthane sont jointes et scellées par une bande de chlorure polyvinylique, la surface de contact entre ces parties étant préparée par modification hydroxylique pour permettre le scellement des feuilles thermoplastiques. Cette jointure est réalisée par un procédé qui évite la nécessité de recourir à un traitement spécial des surfaces à un moment déterminé avant la réalisation de la jointure et qui évite également la nécessité d'élever la température au moment de la réalisation de la jointure. Un procédé de jointure à l'aide de ces feuilles thermoplastiques seules est également présenté.
Bertram Richard L.
Nexus Law Group Llp
LandOfFree
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