Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1987-12-15
1989-06-27
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
264 54, 264237, 264257, 26432812, 264DIG83, 521 91, 528176, 528191, 528195, C08G 6318, B29C 2500, B29D 2700
Patent
active
048431095
ABSTRACT:
Shaped articles are provided containing a polymer which is capable of exhibiting anisotropy in the melt characterized in that the ratio of the stiffness in any two directions at right angles in the shaped article differs by at least 10%, and preferably by at least 50%, from the ratio in the same two directions for a control sample made from a melt consisting entirely of the polymer in anisotropic form.
These may be obtained by a variety of methods including disturbing the normal flow pattern of flow into a mould by including obstacles to flow in the mould, disturbing the pattern of flow by foaming in the mould, by including fillers or by using polymers capable of existing as a bi-phase anisotropic and isotropic melt and forming shaped articles in which the two-phase disposition is retained.
REFERENCES:
patent: 4508891 (1985-04-01), Bailey et al.
Bailey Derrick S.
Cogswell Frederic N.
Griffin Brian P.
Foelak Morton
Imperial Chemical Industries plc
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