PVC Products for the Production of Rigid Films - Vinnolit

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Page 8/9PVC with High Molecular Weight for Antiblocking, Matting and Texturing® Vinnolit K 240® Vinnolit C 100 V® Vinnolit K 221Definitions:Blocking refers to the tendency for contactinglayers of plastic materials to stick together.The effect is enhanced by smooth surfaces. Asa result high forces must be overcome whenreels of film or sheet are being unwound, and itis more difficult to remove individual cut sheetsfrom a stack.Matting can be equated with a reduction of thesurface gloss. To the eye the sheet remainssmooth.Texturing is a special surface effect that canalso be achieved by means of embossing withsand-blasted rollers. The surface appearsuniformly rough, and the irregularities can beobserved with the naked eye.Antiblocking, matting and texturing properties areachieved by the selective introduction of irregularitiesinto the sheet or film. These irregularities takethe form of particles, which, although they arefirmly embedded in the product, cause small elevationsat the surface (see Fig. 6). Even relativelysmall amounts of Vinnolit K 240, C 100 V orK 221 produce the desired effect. Whether thesurface will be non-blocking, matt or textured dependson the size and amount of added particles.Even very small additions will prevent the blockingof sheet. Thus, only 0.3 – 1 phr K 240 or C 100 Vresult in a sufficient number of bumps so that individuallayers are no longer in intimate contact witheach other (see Fig. 7). These “spacers” cannotbe recognised visually.Fig. 7: Two film layers with "spacers“ causedby K 240The same applies to matt films if the quantity ofK 240 or C 100 V is increased to 3 – 10 phr. Theincident light is scattered by the uneven surface,which then appears to be matt or even “dull”(Fig. 8).reflectometer value (60°)1005000 5 10 15 20 25phr C 100 VFig. 8: Matting effect of C 100 V in rigid film.The reflectometer value shows the decreasinggloss.Fig. 6: Surface elevations on a film surfacecaused by K 221Vinnolit K 240, C 100 V or K 221 are used in theformulations as an additive. The number and sizeof particles present in the sheet are decisive fornon-blocking, matt or textured sheet.The individual particles of K 221 are exceptionallystable. During the usual conditions of thermoplasticprocessing, these particles are neither shearednor swollen by plasticizers and keep their initialsize of approximately 35 – 40 µ. Correspondinglyhigh elevations appear on the sheet surface.These are seen not as matt but rather as a “sandblasted”,textured surface. 5 – 10 phr K 221 producea “frosted" effect in transparent film, whichnevertheless retains a high contact transparency(underlying pictures or handwriting).Vinnolit K 240, C 100 V and K 221 result in “formulationmatt” surfaces. In contrast to mechanicalembossing e.g. with sand-blasted rollers, the desiredsurface structure is retained during subsequentdeformations such as vacuum forming.
Page 9/9General InformationFurther information and recommendations forprocessing can be obtained from our technicalsupport staff and representatives.The data and recommendations contained in thisbrochure represent the current state of our knowledgeand serve as a guide only to our productsand their potential applications. Therefore, nowarranty of specific properties of the productsmentioned herein nor of their suitability or fitnessfor a particular purpose is implied.The information given in this brochure should bechecked by preliminary trials because of conditionsduring processing over which we have nocontrol, especially where other companies’ rawmaterials are also being used.Patent or other proprietary rights of third partiesmust be observed. The quality of our products iswarranted under the terms of our General Conditionsof Sale.® Registered Trademark of Vinnolit GmbH & Co.KG, GermanyIsmaning, July, 2011Vinnolit GmbH & Co. KGCarl-Zeiss-Ring 25D-85737 IsmaningGermanyTel. +49 89 961 03-0Fax +49 89 961 03-103
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Page 7: Page 7/9Grafted Copolymers for Flex

PVC Products for the Production of Rigid Films - Vinnolit

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