Aqueous polymer dispersion, process for preparing the same and i

Details Aqueous polymer dispersion, process for preparing the same and i Aqueous polymer dispersion, process for preparing the same and i

1998-12-23

2000-10-17

Yoon, Tae

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524742, 524747, 526 81, 526 82, 526234, 8 941R, 8 9423, 252 857, C08K 541, C08F 224, C14C 900, C14C 312, C14C 322

Patent

active

061333727

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to aqueous polymer dispersions obtainable by polymerizing monoethylenically unsaturated, acid groups-containing monomers in acid, partially or completely neutralized form, optionally further monomers copolymerizable therewith, in the presence of hydrophilized vegetable and/or animal and/or technical fats or oils. The present invention further relates to a process for their production, their use in the production of oil-in-water emulsions by adding a further oil phase which is formed of vegetable, animal or technical oils and/or fats and/or non-self-emulsifying silicones, their use in manufacturing leather and fur skins, and to leather and fur skins produced by means of these agents.
In leather manufacturing the use of acid groups-containing polymers is known to achieve special leather properties. There are several publications relating to the use of hydrophilic, water-soluble polymers in the so-called retannage. In this connection, achieving a full additional tannage is of minor importance; the aim is rather an improvement of different leather properties, such as tensile strength, fullness, levelness of color, or grain pattern. DE 42 27 974 A1 of applicant and the literature cited therein represent examples for this field.
For some time now, special polymers have increasingly been used in fatliquoring or waterproofing of leather. In general, these products are water-dispersible, amphiphilic polymers such as those described in EP 372 746. Although these products are said to have retanning properties, they are mostly insufficient when used alone. On the other hand, to obtain particularly soft leather types, it is frequently also necessary to use additional conventional fatliquors known to the skilled artisan.
In this connection, it would be desirable to combine fatliquors and retanning polymers in one product. Practice has shown that these formulations frequently result in intolerances leading to unstable, phase-separating products.
DE-OS 14 94 858 (priority: U.S. Pat. No. 3,408,319) describes tanning materials produced by copolymerizing a) 80-90% acrylic acid, methacrylic acid, or mixtures of both and b) 10-20% sulfation products of vegetable or animal oils, wherein the oil component must contain double bonds. Copolymerization is conducted such that fat component and water are charged into the reactor and heated to about 90.degree. C. After that, initiator and optionally chain-transfer agents are metered over a longer period of time. Finally, neutralization is effected. The aqueous solutions thus produced are used in solo or combination tannage of hides, and they are to avoid cracking of the leather grain. Using such products in wet end finishing is not described.
EP 24 886 describes a process for the tannage of leather. In a first step the hide prepared in usual manner is treated with a polymer dispersion of methacrylic acid, acrylic acid, and optionally sulfated unsaturated oils (according to U.S. Pat. No. 3 408 31 9), such as sulfated castor oil. This is followed by a treatment with a mineral tanning agent, for example, a zirconium component. In this manner, very rigid, hard leathers are obtained which are suitable as sole leather, for example. In this case, a use in wet end finishing is not mentioned either.
EP 332 342 describes a process for preventing the deposition of dyes from soil components on polyamide materials. In this process the polymers already mentioned in EP 24 886 are used.
In Leather Science, vol. 25 (1 978), pages 22-33 and pages 507-512, E. P. Kaniappan et al. describe the production of copolymers of acrylic monomers, in particular methacrylic acid and sulfated castor oil, and their use in leather manufacture. Polymerization is carried out by charging the fat component and water and metering the monomer and initiator at a temperature of 80.degree. C. Here, it is expressly pointed out that castor oil was chosen for the examinations because--owing to the chemical structure--it still had double bonds even after sulfation and could therefore be copolymerized.

REFERENCES:
patent: 3408319 (1968-10-01), Rau
patent: 3591541 (1971-07-01), Athey et al.
patent: 4054716 (1977-10-01), Toepfl
patent: 4134867 (1979-01-01), Toepfl
patent: 4590236 (1986-05-01), Koenig et al.
patent: 5115013 (1992-05-01), Roettger et al.
patent: 5316860 (1994-05-01), Stewart et al.
patent: 5387640 (1995-02-01), Michels et al.
patent: 5620748 (1997-04-01), Birkhofer et al.
S. Mueller, et al., Angewandte Makromolekulare Chemie 204, 1993-05187, 1993.
WSCA Abstract, Ref. 421781, JP 05 214 676.
Paperchem2 Abstract, Ref. 81:2106, CS 181533, Feb. 15, 1980.
Caplus Abstract, Ref. 1982:546507.

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