Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1993-02-25
1994-08-02
Ryan, Patrick J.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
428454, 4285375, B32B 900
Patent
active
053344499
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a paper coated on one side, a method for its manufacture, and its use.
In the state of the art, cast coated papers of good surface smoothness and high gloss have long been known. DE-B-1233248 describes a cast coating process in which a coating composition containing a metallic pigment and organic binding agent is for example applied to a paper web and dried in contact with a heated high-gloss cylinder.
For the production of papers with a high metallic gloss, coatings have already been proposed which are produced by precipitating metal vapors produced in a high vacuum onto papers provided with special coatings.
According to U.S. Pat. No. 3,113,888, a paper with a coating produced by the cast coating process is used. The coating consists of a synthetic resin binding agent which is not film-forming at normal temperature, whose particles have a melting point between 71.degree. and 99.degree. C. If desired, the coating can be applied onto a base coating which contains one of the common synthetic resin binding agents in addition to a filler. A part of the synthetic resin binding agent to be used in the base coating can also be replaced with natural binding agents, so that 10 to 30 wt. % of the total binding agent content in the base coating consists, for example, of starch, modified starch, methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose and similar substances.
For the preparation of the coating to be metalized, the so-called "direct method," as described above regarding DE-B-1233248, is given and also the "indirect method," in which the coating composition is applied to the high-gloss cylinder and before it is dried the dry paper is brought into contact with the still wet film, the latter being absorbed by the paper and drawn from the drum.
In the process disclosed in DE-B-2310891 it is not the cast coating process (also called "direct method") disclosed in DE-A-1233248 that is involved. Instead, with simultaneous formation of a continuous film from the polymer contained in the coating composition, first part of the water is evaporated and the film that is formed is finished against a high-gloss cylinder at a temperature above 100.degree. C. under a minimum pressure of 5 kp/cm.sup.2. To keep the film from sticking to the high-gloss cylinder during the shaping that occurs under pressure, a stick-reducing agent can be added up to an amount below 30%. Sodium carboxymethyl cellulose, methyl cellulose, polyvinyl alcohol and polyvinyl pyrrolidone are proposed among other substances for this purpose, in amounts up to 10% of the weight of the main polymer. Provided as the base coating are the common preliminary coatings used in papermaking, with and without the addition of pigments.
EP-B-98368 discloses a metalized paper in which the coating provided for the metalizing is formed under conditions similar to those stated in DE-B-2310891. The coating composition contains 5 to 25 parts by weight of film-forming binding agent per 100 weight-parts of pigment, and thus has the pigment-to-binding agent ratio of conventional paper coatings. The difference from the other paper coatings, however, is the addition of a synthetic polymer pigment, which is added in an amount of 5 to 100 wt. % of the total pigment content. By this proposal the previously existing disadvantage is said to be eliminated, which consisted in the fact that the coating surface provided for metalizing first had to be provided with a preliminary lacquering on the basis of organic solvents. However, even the proposal of EP-B-98368 is not free of disadvantages, either, because the coating to be metalized must be produced in a minimum amount of 10 g/m.sup.2, preferably with an applied weight of 18 to 26 g/m.sup.2. Another disadvantage is the high costs of the synthetic polymer pigment.
In the abstract No. 75-35061W of the WPI, Week 7521, Derwent P. L. London (citing JP-A-118906/1974) there is disclosed a paper with a cover coat applied by the cast coating process, for whose preparation first a prime coat is appli
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Bergmann Werner
Dahling Paul H.
Lee Kam F.
Ryan Patrick J.
Stora Feldmuhle Aktiengesellschaft
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