Maro Publications


Patent Abstracts

from 4/15/2013

Maro Topics


Patent Abstracts

1. Superplasticizers

U.S. Patent 8,563,631 (October 22, 2013), “Viscosity-Reducing Super-Plasticising Copolymers,” David Rinaldi, Horacio Naranjo, Martin Mosquet, Philippe Maitrasse, and Alexandre Desseroir (Lafarge, Paris, France, and Chryso, Issy les Moulineaux, France).

Fluidity is critical in pouring concrete.  Water is frequently added to maintain fluidity from mixing to pouring.  Unfortunately adding water leads to mechanical degradation and cracking of the final concrete structure.  This is especially important for self-levelling concrete.  Polyalkoxylated polycarboxylate comb copolymers (PCPs) are super-plasticisers for concrete which maintain fluidity without additional water.  However, these mixtures are complex and difficult to control.  Rinaldi et al found that acrylic copolymers with mixtures of acid and hydrophobic groups improve consistency and simplify formulation.  Typical hydrophobic groups are oxypropylene and oxybutylene.  Their copolymers consist of a main chain of (meth)acrylic acid units with side chains of polyoxyalkylated groups.  These copolymers contain 1 to 8 wt% of statistically-distributed hydrophobic units.


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(RDC 6/5/2012)


Roger D. Corneliussen

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** Date of latest addition; date of first entry is 4/15/2013.