Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Reexamination Certificate
2000-12-12
2003-11-11
Sergent, Rabon (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
C424S070110, C524S002000, C524S003000, C524S004000, C524S007000, C524S442000, C524S444000, C524S591000, C524S839000, C524S840000, C528S070000, C528S085000, C528S076000, C528S077000
Reexamination Certificate
active
06646093
ABSTRACT:
DETAILED DESCRIPTION OF THE INVENTION
1. Technical Filed
The present invention relates to novel water-soluble polyurethane having a comb-shaped hydrophobic group.
The present invention also relates to an extruding auxiliary using the above novel water-soluble polyurethane, an extruding composition of a cement material containing the extruding auxiliary, and extruded forms of a cement material having improved strength obtained by extruding the above extruding composition of a cement material. The present invention further relates to a novel thickening agent for a mortar available for widely varying types of mortar such as repairing mortar, tile-bonding mortar, masonry mortar, spraying mortar, substrate mortar and topping mortar. The present invention further relates to a novel thickening agent for an underwater concrete and a composition for an underwater concrete containing the novel thickening agent for an underwater concrete. The present invention further relates to a novel ceramics forming binder. And the present invention further relates to a novel moisturizer for hair cosmetics excellent in moisture retention to hair.
2. Background Art
When extruding a mortar comprising a cement, a fine aggregate, a fiber and water with a vacuum extruder or the like to produce cement plates extruding the same, in order to extrude the mortar without separating water therefrom, in other words, in order to impart water retention to the mortar, there has been a need to add a water-soluble polymer to the mortar (refer to, for example, Japanese Patent Publication No. 43-7134). In order to develop sufficient water retention, the aqueous mortar solution needs to have a high viscosity, and water-soluble cellulose ethers such as methyl cellulose (MC), hydroxypropyl methyl cellulose (HPMC) and hydroxyethyl cellulose (HEC) are mainly used as the water-soluble polymer at present.
In order to retain the shape of extruded forms immediately after extrusion, in other words, in order to impart shape retention to mortar, the mortar needs to exhibit excellent thixotropic properties; and, it was not sufficient to impart shape retention thereto by an addition of only the water-soluble polymer such as methyl cellulose to the mortar. Thus, asbestos has been used in combination with water-soluble cellulose ethers (refer to, for example, Japanese Patent Publication No. 43-7134).
So, in the conventional extrusion process, the requirements of water retention and shape retention of mortar in extruding mortar have been satisfied by the use of asbestos in combination with water-soluble cellulose ethers.
In recent years, however, the harmfulness of asbestos has been pointed out and restrictions have been imposed on its use. As a result, the fibers such as various types of polymer fibers and glass fibers have become in use as substitutes for asbestos. The mortar using these asbestos-substitute fibers is, however, inferior in shape retention to the mortar using asbestos. Thus, there have been demands for the development of novel extruding auxiliary capable of imparting water retention as well as sufficient shape retention to mortar with the use of asbestos-substitute fibers.
On the other hand, the water-soluble cellulose ethers have a problem that they are likely to trap bubbles when mixing mortar, and due to the bubbles, the strength of the extruded forms of the mortar is likely to decrease.
In addition, the water-soluble cellulose ethers are relatively expensive because they are semisynthetic polymers produced from special natural wood pulp as a raw material and boost the raw material costs of the extruded forms. Furthermore, the natural wood pulp as resources is limited. Thus, a novel extruding auxiliary has been desired which can be synthesized from less expensive industrial materials.
Under those circumstances, the present inventors found an extruding auxiliary which is synthesized using polymer having a comb-shaped hydrophobic group (Japanese Patent Application Laid-Open No. 10-298261); however, the extruding auxiliary had a problem of its solubility.
The mortar having cellulose ether added thereto is not limited to the extruding mortar as described above, and various types of mortar have been used, wherein the mortars are thickened by the addition of cellulose ether thickening agents so as to improve its workability and prevent bleeding from occurring.
The cellulose ether mortar thickening agents (specifically, methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethylmethyl cellulose, hydroxyethyl cellulose, hydroxyethylethyl cellulose, etc.) impart moderate thixotropic properties as well as water retention to mortar to be useful for improvement in workability (for example, making trowelling easier) and for prevention of bleeding. However, they have a disadvantage of inhibiting hydration reaction of mortar, and hence retarding curing time. This has caused problems of making curing time longer in particular under low temperature conditions (for example, outdoors in the winter) and making the mortar strength insufficient.
When placing concrete under water, it is also known that a water-soluble thickening agent is added to the concrete as an underwater anti-separating agent in order to avoid the separation of its mortar and aggregate under water (for example, Japanese Patent Application Laid-Open No. 57-123850). In order for the thickening agent to develop sufficient underwater anti-separating properties, the aqueous solution needs to have a high viscosity; thus, as the polymers for thickening agents, water-soluble cellulose ethers such as methyl cellulose (MC), hydroxypropyl methyl cellulose (HPMC), hydroxyethyl methyl cellulose (HEMC) and hydroxyethyl cellulose (HEC) are widely used at present.
The water-soluble cellulose ethers, however, have a problem of retarding the curing time of concrete (retarding setting) which may make the concrete strength easier to decrease.
Further, the water-soluble cellulose ethers have problems in terms of their costs and raw material supply since they are semisynthetic polymers, as described above. Thus, a novel thickening agent for an underwater concrete, which can be synthesized from less expensive industrial materials, has been desired.
In the forming of ceramics, particularly in extrusion of ceramics, an extrusing binder composed of a water-soluble polymer is blended so as to impart sufficient plasticity, tackiness and lubricating properties to the green sand, and various types of cellulose ethers such as methyl cellulose (MC) and hydroxypropyl methyl cellulose (HPMC) are widely used as the polymers.
The cellulose ethers, however, have a problem that their heat release in degreasing is rapid and the heat release value is high, therefore, the extruded forms are likely to be damaged at the time of degreasing. Furthermore, it is also a problem that carbonized residues or carbonized inorganic salts are likely to remain after degreasing (high carbon residue content).
Hair cosmetics such as hair conditioner, hair gel, hair foam, shampoo and rinse require moisturizer, which contains water-soluble polymer, so as to create moist feel. And, as the polymers for such cosmetics, water-soluble polymers such as polyethylene glycol (PEG) or various types of cellulose ethers are widely used at present.
However, for polyethylene glycol, it has a problem of creating a sticky hair impression, but not creating moist feel. At the same time, cellulose ethers such as hydroxyethyl cellulose (HEC) also have a problem of creating a stiffed hair impression, but not creating moist feel.
SUMMARY OF THE INVENTION
An object of the present invention is to provide novel water-soluble polyurethane having a comb-shaped hydrophobic group.
Another object of the present invention is to provide a novel extruding auxiliary to replace water-soluble cellulose ethers which is more economical, is capable of imparting excellent shape retention to mortar and excellent strength of the extruded forms of mortar, and has an improved solubility. Still another object of the invention is to provide an extruding composition of
Mitsuzuka Masahiko
Tsuruta Manabu
Wu Yunzhi
Birch & Stewart Kolasch & Birch, LLP
Mitsui Chemicals Inc.
Sergent Rabon
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