FIELD: chemistry.
SUBSTANCE: invention relates to improved phthalate-free polyvinyl chloride (PVC) plastisol compositions for the production of decorative surface coverings, in particular floor and wall coverings with low emission of volatile organic compounds, to a method for the preparation of said phthalate-free PVC plastisols and to a process for the production of said surface coverings. Phthalate-free polyvinyl chloride (PVC) based plastisol composition for decorative surface coverings exhibiting low VOC (volatile organic compound) emission, comprising from 10 to 200 parts by weight per 100 parts of polyvinyl chloride of a plasticiser blend comprising the following parts per weight ingredients: from 5 to 190 parts of one or more phthalate-free primary plasticisers characterised by a solution temperature at the clear point between 130 and 200 °C and vapour pressure at 25 °C less than 5-10-3 mm Hg; from 1 to 100 parts of one or more than one phthalate-free secondary plasticiser, characterised by a solution temperature at the clear point of less than 130 °C and vapour pressure at 25 °C less than 10-1 mm Hg.; wherein the solution temperatures of the one or more primary and the secondary plasticisers are measured according to DIN 53408 on suspension PVC with a K-value of 71; the vapour pressure of the one or more primary and secondary plasticisers is measured according to ASTM E1194-07, where the ratio of the content of said one or more phthalate-free primary plasticisers to the content of said one or more phthalate-free secondary plasticisers is between 0.1 and 10 in order to reduce the gelation temperature exhibited by said plastisol in the presence of only one or more primary plasticisers, at least at 5 °C.
EFFECT: providing phthalate-free plasticizer blends for polyvinyl chloride plastisols with good gelation properties, where these formulations permit rapid processing and/or reduced energy consumption in processing.
20 cl, 1 dwg, 4 tbl
