Abstract: The present invention is in the field of optical recording media, and is directed to an optical recording medium which comprises the following layers;a) a grooved transparent substrate (1), superposed byb) a recording layer comprising a partial mirror (2) of a material having a high complex index of refraction which is not within the pentagon defined by the vertices 7.15 - i3.93, 7.15 - i5.85, 8.96 - 6.28, 9.56 - i5.90, and 8.14 - i3.77 in the n,k plane, superposed by a buffer layer (3) comprising a nonliquid-crystalline high-molecular weight material and optionally a dye, superposed by a thick reflective layer (4), together forming a Fabry-Perot wherein the thickness (d) of the buffer layer within the grooves is set so that the reflection of the medium is in the high reflective state, optionally superposed byc) a protective coating (5).By virtue of the partial mirror, the buffer layer, and the thick reflective layer a Fabry-Perot etalon is created.

Abstract: In a recordable/replayable optical recording medium having a thin metal recording layer and an optical recording method therefor, the optical recording medium includes a substrate, a thin metal film formed on the substrate, a reflective layer arranged on the thin metal film, a buffering layer interposed between the thin metal film deformed by heat, and a protecting layer for protecting the deposited layers. Recording is facilitated by adopting a buffering layer and compatibility with conventional CD players is possible. Since expensive organic dyes are not necessary, manufacturing costs can be reduced and productivity can be greatly improved.

Abstract: A binder for low density lipoproteins (LDL) consisting of sulphated polyvinyl alcohol which is cross-linked by the chemical or the physical route to a waterinsoluble product. The binder may be in the form of a hydrogel which is applied or not to a carrier or it may be present on the surface of a polyvinyl alcohol fibre which is preferably in the form of tape having a thickness of 0,1 to 2 .mu.m and a width of 0,5 to 6 .mu.m. The fibre shaped binder is prepared by successively cross-linking with an acidified aqueous solution of glutardialdehyde and sulphating with chlorosulphonic acid.

Abstract: A binder for low density lipoproteins (LDL) consisting of sulphated polyvinyl alcohol which is cross-linked by the chemical or the physical route to a waterinsoluble product. The binder may be in the form of a hydrogel which is applied or not to a carrier or it may be present on the surface of a polyvinyl alcohol fibre which is preferably in the form of tape having a thickness of 0.1 to 2 .mu.m and a width of 0.5 to 6 .mu.m. The fibre shaped binder is prepared by successively cross-linking with an acidified aqueous solution of glutardialdehyde and sulphating with chlorosulphonic acid.