1-15. (canceled)
16. Skincare composition comprising at least one polyurethane obtainable by reacting one or more water-insoluble, non-water-dispersible, isocyanate-functional polyurethane prepolymers A) with one or more amino-functional compounds B).
17. Skincare composition comprising at least one polyurethane obtainable by reacting one or more isocyanate-functional polyurethane prepolymers A) which have essentially neither ionic nor ionogenic groups, with one or more amino-functional compounds B).
18. Skincare composition according to claim 16, wherein the amino-functional compounds B) are selected from primary andor secondary amines andor diamines.
19. Skincare composition according to claim 16, wherein the amino-functional compounds B) include at least one diamine.
20. Skincare composition according to claim 16, wherein the amino-functional compounds B) are selected from amino-functional compounds B2) which have ionic andor ionogenic groups, and amino-functional compounds B1) which have no ionic andor ionogenic groups.
21. Skincare composition according to claim 16, wherein the amino-functional compounds B) include at least one amino-functional compound B2) which has ionic andor ionogenic groups, preferably 2-(2-aminoethylamino)ethanesulphonic acid andor salts thereof.
22. Skincare composition according to claim 16 wherein the amino-functional compounds B) include at least one amino-functional compound B1) which have no ionic andor ionogenic groups, preferably a diamine which has no ionic andor ionogenic groups.
23. Skincare composition according to claim 16, wherein the amino-functional compounds B) include both amino-functional compounds B2) which have ionic and ionogenic groups, and also amino-functional compounds B1) which have no ionic andor ionogenic group.
24. Skincare composition according to claim 16, wherein the prepolymers A) are obtainable by reacting one or more polyols selected from the group which consists of polyether polyols, polycarbonate polyols, polyether-polycarbonate polyols andor polyester polyols, and one or more polyisocyanates.
25. Skincare composition according to claim 16, wherein the polyurethane contains at least one sulphonic acid andor sulphonate group, preferably a sodium sulphonate group.
26. Skincare composition according to claim 16, characterized in that at least one active ingredient andor one humectant is present.
27. Cosmetic method for skincare which involves applying a composition comprising at least one polyurethane obtainable by reacting one or more water-insoluble, non-water-dispersible, isocyanate-functional polyurethane prepolymers A) with one or more amino-functional compounds B) to the skin.
28. Cosmetic method according to claim 27, wherein the composition, following application to the skin, at least partially remains on it.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. An oscillating piston type compressor comprising: a cylinder having a hollow cylinder chamber; a piston formed integral with a plate-shaped blade, which is supported by the cylinder to be capable of rocking and radially sliding relative to the cylinder and partitions the cylinder chamber into a suction chamber and a compression chamber; a crankshaft inserted into the piston to cause the piston to make orbital motion in the cylinder chamber; and end plates supporting the crankshaft and closing both end openings of the cylinder, and a recess or a protrusion formed on a radial end surface of the blade of the piston to serve as a reference for positioning relative to an axis of the piston.
2. The oscillating piston type compressor according to claim 1, wherein the recess formed on the blade of the piston is a groove tapered to have a cross section in a direction perpendicular to the axis of the piston, decreasing in width toward the axis, and an extension of an axis of symmetry of the tapered portions runs substantially through a center of a cylindrical portion.
3. The oscillating piston type compressor according to claim 1, wherein a material for the piston is a sintered alloy adapted for molding with a die, and the recess or protrusion is molded with the die.
4. A method of manufacturing an oscillating piston, in which side surfaces of a plate-shaped blade projectingly and integrally formed on a piston are processed, the method comprising the steps of forming a recess or a protrusion, which makes a reference for positioning relative to an axis of the piston, on a radial end surface of the plate-shaped blade, and thereafter using two grinding stones with opposed annular grinding surfaces to perform grinding on two side surfaces of the blade in a state, in which an inside or outside diameter portion of the piston is supported and a support member is fitted into the reference from radially of the blade to support the same.
5. The method according to claim 4, wherein after a gap defined between the two grinding stones is made larger than a width of the blade before double grinding, the blade is moved about processing portions of the two grinding stones and two side surfaces of the blade are processed while the gap between the two grinding stones is being decreased.
6. The method according to claim 4, wherein an oblique angle is imparted to axes of rotation of the two grinding stones provided with opposed annular grinding surfaces, the grinding stones are configured to have portions in parallel to a median line of the oblique angle in a region where the gap between the two grinding stones becomes smallest, the grinding stones and the piston are arranged such that a center line of the gap defined between the two grinding stones formed in parallel to each other coincides with a line running through centers of a groove formed on the blade of the piston and a cylindrical portion of the piston, the blade of the piston is caused to reciprocate or pass repeatedly in one direction through the gap defined between the two grinding stones, and the blade is processed while the gap between the grinding stones is sequentially decreased.
7. The method according to claim 5, wherein an oblique angle is imparted to axes of rotation of the two grinding stones provided with opposed annular grinding surfaces, the grinding stones are configured to have portions in parallel to a median line of the oblique angle in a region where the gap between the two grinding stones becomes smallest, the grinding stones and the piston are arranged such that a center line of the gap defined between the two grinding stones formed in parallel to each other coincides with a line running through centers of a groove formed on the blade of the piston and a cylindrical portion of the piston, the blade of the piston is caused to reciprocate or pass repeatedly in one direction through the gap defined between the two grinding stones, and the blade is processed while the gap between the grinding stones is sequentially decreased.
8. The method according to any one of claims 4 to 7, wherein processing is performed by adding an oscillation motion, in which the blade of the piston is caused to reciprocate in a radial direction of the grinding stones arranged opposed to each other.
9. The method according to any one of claims 4 to 7, wherein a material for the piston is made from a sintered alloy adapted for molding with a die, the recess or protrusion serving as the reference is formed on a radial end surface of the blade upon molding with the die, and thereafter double grinding is applied on side surfaces of the blade.
10. The method according to claim 4, wherein processing is performed by adding an oscillation motion, in which the blade of the piston is caused to reciprocate in a radial direction of the grinding stones arranged opposed to each other, and wherein a material for the piston is made from a sintered alloy adapted for molding with a die, the recess or protrusion serving as the reference is formed on a radial end surface of the blade upon molding with the die, and thereafter double grinding is applied on side surfaces of the blade.
11. The method according to claim 5, wherein processing is performed by adding an oscillation motion, in which the blade of the piston is caused to reciprocate in a radial direction of the grinding stones arranged opposed to each other, and wherein a material for the piston is made from a sintered alloy adapted for molding with a die, the recess or protrusion serving as the reference is formed on a radial end surface of the blade upon molding with the die, and thereafter double grinding is applied on side surfaces of the blade.
12. The method according to claim 6, wherein processing is performed by adding an oscillation motion, in which the blade of the piston is caused to reciprocate in a radial direction of the grinding stones arranged opposed to each other, and wherein a material for the piston is made from a sintered alloy adapted for molding with a die, the recess or protrusion serving as the reference is formed on a radial end surface of the blade upon molding with the die, and thereafter double grinding is applied on side surfaces of the blade.
13. The method according to claim 7, wherein processing is performed by adding an oscillation motion, in which the blade of the piston is caused to reciprocate in a radial direction of the grinding stones arranged opposed to each other, and wherein a material for the piston is made from a sintered alloy adapted for molding with a die, the recess or protrusion serving as the reference is formed on a radial end surface of the blade upon molding with the die, and thereafter double grinding is applied on side surfaces of the blade.