Patents with Abstracts
Patents with Abstracts
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.
Polyvinyl chloride compositions
Olsen and Stimpson of Eastman Chemical Company, Tennessee, developed a polyvinyl chloride composition having polyvinyl chloride resin and a plasticizer ester selected from di-butyl terephthalate, di-isobutyl terephthalate, or mixtures thereof. These plasticizers are high solvating plasticizers resulting in better low temperature properties and improved stain resistance than other high solvating plasticizers.
Plasticised polyvinyl chloride
Gosse et al of ExxonMobil, Texas, developed esters of cyclohexane polycarboxylic acids as plasticizers for polyvinyl chloride to enable products with comparable mechanical properties to be obtained using less polyvinyl chloride. Use of these esters also produces formulations with increased stability to ultra-violet light, improved low temperature properties, lower viscosity and improved processability as well as reduced smoke on burning. The esters of cyclohexane polycarboxylic acids may be used alone or in admixture with other plasticizers when the esters of cyclohexane polycarboxylic acids may act as viscosity depressants. Fast fusing plasticizers may also be included. The formulations are particularly useful in the production of a range of goods from semi-rigid to highly flexible materials and are particularly useful in the production of medical materials such as blood bags and tubing. (RDC 10/17/2012)
Plasticized polyolefin compositions
Yang et al of ExxonMobil, Texas, developed a plasticized polyolefin consisting of one or more polyolefins and one or more non-functionalized plasticizers where the non-functionalized plasticizer is a polyalphaolefin comprising oligomers of C5 to C14 olefins having a Kinematic viscosity of 10 cSt or more at 100.degree. C. and a viscosity index of 120 or more. (RDC 7/10/2012)
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Roger D. Corneliussen
Maro Polymer Links
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Copyright 2012 by Roger D. Corneliussen.
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** Date of latest addition; date of first entry is 7/10/2012.