ISO INTERNATIONAL STANDARD 2115 Third edition 1996-02-15 Plastics - Polymer dispersions Determination of white point temperature and minimum film-forming temperature Plastiques Dispersions de polymeres - Determination de la température de point blanc et de la température minimale de la formation de film ISO Reference number ISO2115:1996(E) ISO 2115:1996(E) Foreword preparing International Standards is normally carried out through isO technical committees. Each member body interested in a subject for which resented on that committee. International organizations, governmental and non-governmental, in liaison with isO, also take part in the work. isO coliaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International a vote. International Standard ISO 2115 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 9, Thermoplastic materials, in close collaboration with ISO/TC 35, Paints and varnishes. This third edition cancels and replaces the second edition (ISO 2115:1976), which has been extended and harmonized, taking account of the require- ments of ISO/TC 35, Paints and varnishes. @ISO1996 Ail rights reserved.Unlessotherwisespecified, nopartof thispublicationmaybereproduced microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland ii ISO 2115:1996(E) INTERNATIONAL STANDARD ISO Plastics -- Polymer dispersions Determination of white point temperature and minimum film-forming temperature Scope 3.1 polymer dispersion: Polymeric material finely 1 dispersed in a liquid phase,which is usually water. During drying, the liquid evaporates and as a result the This International Standard specifies a method for the tiny particles are forced closer together until they determination of the "white point" temperature and touch each other. the minimum filim-forming temperature of polyme dispersions. Depending on the type of polymer, the temperature and the possible influence of any auxiliaries present, the particles - - when spread out in a thin layer on a 2 Normative references substrate- -interacttoform either The following standards contain provisions which through reference in this text, constitute provisions of a discontinuous opaque white mass in which the this International Standard. At the time of publication, polymer particles are not fused together if the the editions indicated were valid. All standards are temperature is insufficient to allow coalescence of subject to revision, and parties to agreements based the particles; on this International Standard are encouraged to investigate the possibility of applying the most recent or editions of the standards indicated below. Members a continuous transparent layer in which the par- of IEc and ISO maintain registers of currently valid ticles combine to form a homogeneous film if the InternationalStandards. temperature conditions are sufficient to allow coalescence of the particles. ISO 123:1985,RubberlatexSampling. NOTE 1 Coalescence means uniting of particles at least IsO842:-1,Raw materials for paints and varnishes partly by interpenetration of the polymer chains. Sampling. 3.2 white point temperature: The temperature limit ISO12000:2)， Plastics/rubber- Polymer disper- below which an opaque mass, and above which a sions and rubber latices (natural and synthetic) transparent film, is formed. Definitions and review of test methods. 3.3 minimum film-forming temperature: The temperature limit above which a continuous hom- ogeneous film without cracks is observed. 3 Definitions NOTE 2 The white point temperature always lies a few For the purposes of this International Standard, the degrees Celsiusbelowthe minimumfilm-formingtempera- following defi