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Friday, 20 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

Coatings based on acrylic latexes using hydrocarbon resins as osmotic agents

Wednesday, 11 June 2014

Hydrocarbon coumarone-indene resin (HCR)  is a cheap polymer widely used for coatings and pressure-sensitive adhesives.

Waterborne acrylic resins were obtained by miniemulsion polymerisation  Source: Andreas Stix/Pixelio.de

Waterborne acrylic resins were obtained by miniemulsion polymerisation  Source: Andreas Stix/Pixelio.de

Waterborne acrylic resins with a solid content higher than 40 wt% were obtained by miniemulsion polymerisation of methyl methacrylate, butyl acrylate, and acrylic acid using a HCR as osmotic agent.

HCR led to faster film hardness development

The resin leads to a higher hydrophobicity for the acrylic latex film and acts as osmotic agent in miniemulsion polymerisation preventing Ostwald ripening, leading to latexes with particle sizes, size distributions, and stability comparable to those obtained using n-hexadecane as osmotic agent. However, the monomer conversion and molecular weight were lower, indicating the occurrence of a chain-transfer reaction. Atomic force microscopy analysis demonstrated that a smooth film surface with phase-separated morphology was formed when using HCR. Faster film hardness development was achieved with HCR comparing with hexadecane. Compared with market standard in a paint formulation, a similar performance was achieved.

The study is published in: Journal of Applied Polymer Science, Volume 131, Issue 15, 5 August 2014.

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