摘要:
A water-borne coating composition contains as one component a latex of an epoxidised natural rubber. The composition has a low minimum film-forming temperature (MFT), and produces films which are hard, durable and display excellent adhesion to substrate.
摘要:
A pigmented, aqueous coating composition comprising
i) an aqueous dispersion of non-crosslinkable addition oligomer of weight average molecular weight of from 5000 to 15000 Daltons and calculated Fox Tg greater than 0°C and less than 50°C ii) an aqueous dispersion of addition polymer of weight average molecular weight greater than 53,000 Daltons, calculated Fox Tg greater than 10°C and less than 40°C and mean particle diameter of less than 150 nanometers, where the ratio of i):ii) is from 0.25:1 to 2.70:1, based on % weight dispersion solids.
摘要:
A water-based autoxidisable coating composition for application to architectural surfaces, fittings or furnishings at ambient temperatures which contains water, a drier to promote autoxidation and a water-soluble autoxidisable film-forming copolymer which contains 0.5 to 7 wt% of acrylic acid, 50 to 50 wt% of either a hydroxy acrylate chosen from hydroxy ethyl or hydroxyisopropyl acrylate or alternatively a polyethoxylate (meth)acrylate and 30 to 50 wt% of an autoxidisable ester of copolymerised acrylic acid in which the esterifying moieties are 3-allyloxy-2-hydroxypropyl or the methallyl analogue. Also an autoxidisable copolymer of the above composition. The coating composition laps well yet is water-soluble and resistant to both long term and short term damage by water. Also the copolymer for use in the compositions.
A) a stable dispersion in an aqueous medium of a First Polymer having a weight average molecular weight of at least 50,000, which is insoluble in water and which contains silane groups of formula (1); in which a is 0 to 2, R¹ is C₁₋₆ alkyl, and R is OH or a hydrolysable group, the groups of formula (1) contributing from 0.05 to 2% by weight of silicon to the weight of the First Polymer and B) a solution or dispersion of a Second Polymer which has a number average moecular weight of MWt between 1000 and 20,000, and which contains at least two silane groups of formula (1), the groups of Formula (1) contributing from 0.1 to 8% by weight of silicon to the weight of the Second Polymer, and also comprising covalently bonded acid groups in an amount so as to render the Second Polymer soluble or self-dispersible in the aqueous medium, the ratio of the Polymer (A) to the Polymer (B) being in the range 40:1 to 1:4.
摘要:
Compositions capable of curing at ambient or slightly elevated temperatures comprise (i) a compound containing in the molecule at least two hydroxyl groups, in particular a hydroxyl group-bearing addition polymer, (ii) a compound containing in the molecule at least two cyclic carboxylic anhydride groups and (iii) a compound containing in the molecule at least two epoxide groups. The compositions may optionally also contain a catalyst for the reaction between epoxide groups and carboxylic groups. The compositions are of particular value as the basis of roomtemperature-curing coating compositions.
摘要:
A film-forming binder polymer for a coating composition such as a paint, varnish or woodstain where the polymer is modified by the presence of bonded moieties derived from plant gum, particularly plant fibre gum obtainable from plant fibre, especially corn fibre gum and more particularly moieties derived from proteo-xylans and/or furanose. The modified binder polymer minimises the need to use coalescing solvents without producing poor dried paint coatings which fail the scrub resistance tests also improves the opacity of the dried coating composition.