 Shock absorbing suspension |
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| Method for improved metal adhesion and metal adhesion retention |
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| Resistance-weldable composite |
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| Slip clutch with slip detector and electrical disconnect |
| The present invention resides in a selfprotected torque limiter. Briefly, and in general terms, the ... |
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| Suspension system for a tilt cab truck |
| The subject invention is a suspension system for a tilt cab truck in which the shock absorber ... |
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| Security bracket |
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| Linked chain |
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| Offshore platforms |
| What the claim is: 1. An offshore platform support structure comprising a column structure for ... |
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| Multiple bore marine riser with flexible reinforcement |
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|
Support for photographic paper
| Details |
Inventors: Tamagawa, Shigehisa; Fuchizawa, Tetsuro;
Assignee: Fuji Photo Film Co., Ltd. (Kanagawa, JP)
Primary Examiner: Buffalow; Edith
Assistant Examiner:
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas
A support for photographic paper which has a polyethylene coat formed on both sides of a base paper containing a cationic softening agent. In a preferred embodiment, the base paper is surface-sized. The support has improved surface smoothness. |
|
DETAILED DESCRIPTION OF THE INVENTION The softening agent used in the present invention is a cationic softening agent that is capable of self-fixing to cellulose.
Details of self-fixing cationic softening agents are found in Shin-Kami Kako Binran (New Handbook of Paper Processing), pp.
554-555, ed.
by Shigyo Times (1980).
Cationic softening agents having a molecular weight of at least 200 are preferable.
They have a hydrophobic group with 10 or more carbon atoms and also have an amine salt or quaternary ammonium salt which are capable of self-fixing to cellulose.
Specific examples of preferable cationic softening agents include: the reaction product of a maleic anhydride copolymer and a polyalkylenepolyamine; the reaction product of a higher aliphatic acid and a polyalkylenepolyamine; the reaction produce of a urethane alcohol and an alkylating agent; and a quaternary ammonium salt of a higher aliphatic acid, as described, for example, in Japanese patent application (OPI) No.
116705/75, (the term "OPI" as used herein means a "published unexamined Japanese patent application"), Japanese patent publication No.
5118/67, J.
Appl.
Polym.
Sci.
, 9.
2451 (1965) and J.
Oil.
Col.
Chem.
Assoc.
, 53.
363 (1970).
Of these compounds, the reaction product of a maleic anhydride copolymer and a polyalkylenepolyamine and that of a urethane alcohol and an alkylating agent are particularly preferable.
These softening agents can be applied to the base paper either by internal addition or by surface sizing, the former method being more effective and hence preferable.
The effectiveness of the softening agents will of course increase with the amount added, but if they are added in an excessive amount, the strength of the paper is decreased such as to cause breakage and other troubles and the processing cost is also increased.
Therefore, the softening agents are added in amounts ranging from 0.
01 to 3.
0 wt%, more preferably 0.
1 to 1.
0 wt%, based on the dry weight of the pulp in the paper support.
In order to have the softening agents exhibit their effect in a more efficient manner, they are preferably used in combination with sizing agents
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