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Free Flowing Adhesive Compositions

IP.com Disclosure Number: IPCOM000243464D
Publication Date: 2015-Sep-23
Document File: 2 page(s) / 18K

Publishing Venue

The IP.com Prior Art Database

Abstract

This publication describes a means of maintaining free flowing characteristics of polyolefin products applicable to several Hot Melt Adhesive (HMA) applications. Further, this publication describes a means of using additives, known as slip additives, to reduce agglomeration tendency of such polyolefins.

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Free Flowing Adhesive Compositions

Abstract:


This publication describes a means of maintaining free flowing characteristics of polyolefin products applicable to several Hot Melt Adhesive (HMA) applications. Further, this publication describes a means of using additives, known as slip additives, to reduce agglomeration tendency of such polyolefins.

Background:


Slip additives are generally used as additives for polyolefinic polymers used to produce films. In such applications, the additives reduce the coefficient of friction (CoF) between film layers and by doing so facilitate processing (example, unwinding) of the film. Other applications that benefit from reduced CoF are thermoplastic elastomer (TPE) or thermoplastic vulcanizate (TPV) applications, where reduction of CoF by using the additives improves scratch resistance and minimizes squeaking noises. Despite the utility of slip additives in film, TPE, and TPV applications, the use of these additives in Hot Melt Adhesive (HMA) applications is generally not effective in end-use applications. However, studies indicate that such additives may facilitate intermediate HMA product handling.

Free flowing HMA enables further automation of the conventional adhesive application step, thereby favorably reducing time on the packaging step. Fully automated HMA applicators (e.g., integrated melter and filling station) exist for high crystalline packing-type HMAs. Such on-demand melting systems are available from companies like Nordson as FreedomTM and Graco as InvisiPacTM but the same needs exist for HMA melter feed systems like DynafillTM from ITW Dynatec. There is an interest in using on-demand melting systems for applications using softer adhesive (for example: woodworking furniture construction applications, rather than packaging-type applications). Challenges with the use of such softer (medium crystallinity) adhesives have been observed and today those cannot be delivered in a form that can be handled by automated filling stations. Accordingly, discussed herein are methods of producing free flowing pellets from such medium crystallinity HMAs, as well as on-demand melting setup for higher crystallinity HMAs.

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