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US 4,514,449 AGranted
Profile strip, especially for the production of window or door frames
AssigneeDynamit Nobel Aktiengesellschaft
InventorsWolfgang Budich, Bertram Gasper, Josef Kurth, Karl-Gunter Scharf, Waldemar Wissinger
Life of this patent
Estimating the term…
Abstract
A profile strip, especially suitable for the production of window or door frames, has an optionally hollow core profile made from a glass fiber-reinforced PVC composition and a shell made from a synthetic resin compatible with PVC and exceeding the impact resistance of the core profile.
Claims16
A profile strip for the manufacture of frames for windows or doors comprising a core profile formed of reinforced synthetic resin and a synthetic resin shell surrounding at least a part of the core profile;
- said core profile being formed of a glass fiber-reinforced polyvinyl chloride resin-containing composition, additionally containing per 100 parts by weight of a polyvinyl chloride resin having a K value between 55 and 75, 40 to 100 parts by weight of glass fibers having a diameter of between 5 and 25 .mu.m with a length of up to 12 mm, and 0 to 25 parts by weight of a mineral filler with an average particle diameter of below 50 .mu.m;
- said core profile exhibiting a microporous, slightly roughened surface, and said core profile being bonded to the shell;
- said shell being free of glass fibers, being formed of a synthetic resin that is compatible with polyvinyl chloride resin and exceeding the impact resistance of the core profile and said strip exhibiting, in the extrusion direction, a modulus of elasticity of at least 8000 N/mm.sup.2 at 23.degree. C.
Dependencies are inferred from the claim text.