Knowledge base

The use of floor covering materials in houses, buildings ... is so common now, thatthere is a wide variety of these products on the market. There is not only a broadchoice in the type of substrate but also in the type of finishing. To choose one ofthese products, one must know for how long it will resist the service conditions,without losing its de

Gelatin consists of a mixture of water-soluble proteins ranging from about 10000 to several100000 Dalton. It is obtained from its naturally occurring parent protein, collagen, by chemicaland thermal hydrolysis. Aqueous gelatin solutions are well-known for their capability of formingelastic gels. Due to its nontoxic nature, gelatin is widely used in

From its inception and early development, UV curing in the packaging industryhas grown rapidly in the last decade. The early days of this technology wererestricted by the lack of quality equipment, products and knowledge which couldonly be gained by research and development over many years. UV curing wasonce a technology used mainly by the larger s

Radiation curable coatings are significantly more difficult to mat than liquid coatings. In conventional liquidcoatings, solventborne or waterborne, considerable film shrinkage occurs during drying and curing, through the loss of volatiles. A 40 to 80 % volume reduction usually takes place, when the film shrinks to its dry solid form. When low glos

During the past 2 years Polytype has built half a dozen coaters with radiation curingand for high production speeds.This paper deals with sime of these installations and their subassemblies.

Despite the advantages of ultraviolet curable coatings there are still existing drawbacks insome special fields. One of these well-known problems relates to through curing of pigmentedcoatings. The common explanation for the problems which are evident here is that pigments,by absorbing ultraviolet radiation, compete with the photoinitiators and thu

The ongoing environmental discussion has also touched the field of adhesives. In response to the concerns expressed, solvent-free systems are gaining increasing significance in the pressure-sensitive adhesives segment. This trend has also strongly affected radiation-curing hot-melt adhesives, evident from the large amount of literature published on

Polymers with attached functional groups can be used in place of low molecularweight reactants to design reactive systems with improved performances. The paperillustrates this general approach applied to the particular field of UV-curing of polymerizablecompositions. Siloxane copolymers with controlled functionality and/or controlled molecularweigh