1. A process for producing a biaxially oriented polyester film which has a base layer (B) and has a heatsealable outer layer (A) that can be peeled from polyester, where the outer layer (A) comprises from 60 to 99% by weight of polyester which is composed of from 12 to 89 mol % of units derived from an aromatic dicarboxylic acid and of from 11 to 88 mol % of units derived from at least one aliphatic dicarboxylic acid, where the total of the molar percentages is 100, said process comprising the steps of
a) extruding at least the base layer (B) to give an unoriented film;
b) stretching this film in a first direction;
c) stretching this film in a second direction perpendicular to the first
d) heat-setting the stretched film, and
e) producing the outer layer (A) on the base layer (B) by using lamination to apply the outer layer film (A) produced in a separate process, where the lamination step e) takes place prior to step b) or between steps b) and c).
2. The process as claimed in claim 1, wherein the thickness of the outer layer (A) is from 1 to 7 \u03bcm.
3. The process as claimed in claim 1, wherein the lamination step e) is carried out by means of rollers arranged in pairs.
4. The process as claimed in claim 1, wherein the lamination step e) takes place between steps b) and c).
5. The process as claimed in claim 1, wherein operations in step e) take place at a linear pressure of from 20 to 60 Ncm, the temperature being the ambient temperature.
6. The process as claimed in claim 1, wherein step b) is longitudinal stretching of the film and step c) is transverse stretching of the film.
7. The process as claimed in claim 6, wherein the longitudinal stretching takes place at from 60 to 130\xb0 C. and the transverse stretching takes place at from 90 to 140\xb0 C.
8. The process as claimed in claim 7, wherein the longitudinal stretching ratio is from 2.0:1 to 5.5:1 and the transverse stretching ratio is from 2.4:1 to 5.0:1.
9. The process as claimed in claim 1, wherein the film is kept at a temperature of from 150 to 250\xb0 C. for from 0.1 to 10 s during the heat-setting process.
10. The process as claimed in claim 1, wherein the outer layer film (A) is composed of two layers.
11. The process as claimed in claim 1, wherein the aromatic dicarboxylic acids of the polyester of the outer layer (A) have been selected from one or more of the following substances: terephthalic acid, isophthalic acid, and 2,6-naphthalenedicarboxylic acid.
12. The process as claimed in claim 1, wherein the aliphatic dicarboxylic acids of the polyester of the outer layer (A) have been selected from one or more of the following substances: succinic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, glutaric acid, and adipic acid.
13. The process as claimed in claim 1, wherein the polyester of the outer layer (A) contains from 12 to 89 mol % of terephthalate, from 0 to 25 mol % of isophthalate, from 11 to 88 mol % of azelate, from 0 to 50 mol % of sebacate, from 0 to 50 mol % of adipate, and more than 30 mol % of ethylene or butylene, based in each case on total dicarboxylate and, respectively, total amount of alkylene.
14. The process as claimed in claim 1, wherein the outer layer (A) has a minimum sealing temperature of not more than 165\xb0 C. for sealing against APETCPET or CPET trays.
15. The process as claimed in claim 1, wherein the outer layer (A) has a seal seam strength of at least 1.5 N15 mm of film width against APETCPET or CPET trays.
16. The process as claimed in claim 1, wherein the polyester of the outer layer (A) is prepared from two polyesters I and II.
17. The process as claimed in claim 16, wherein the polyester I is composed of one or more aromatic dicarboxylates and of one or more aliphatic alkylenes.
18. The process as claimed in claim 17, wherein the polyester I contains terephthalate units, isophthalate units, and ethylene units.
19. The process as claimed in claim 16, wherein the proportion of the polyester I in the outer layer (A) is from 0 to 50% by weight.
20. The process as claimed in claim 16, wherein the polyester I has a glass transition temperature above 50\xb0 C.
21. The process as claimed in claim 16, wherein the polyester II is composed of one or more aliphatic dicarboxylates and of one or more aromatic dicarboxylates, and of one or more aliphatic alkylenes.
22. The process as claimed in claim 21, wherein the polyester II contains azelate units, terephthalate units, isophthalate units, and ethylene units.
23. The process as claimed in claim 16, wherein the proportion of the polyester II in the outer layer (A) is from 50 to 100% by weight.
24. The process as claimed in claim 16, wherein the polyester II has a glass transition temperature below 20\xb0 C.
25. The process as claimed in claim 1, wherein the outer layer (A) comprises inorganic andor organic particles, at a concentration of from 1 to 10% by weight.
26. The process as claimed in claim 1, wherein the outer layer (A) comprises a polymer incompatible with polyester.
27. The process as claimed in claim 1, wherein the film has three layers and has an A-B-C structure.
28. The process as claimed in claim 1, wherein the base layer (B) is comprised of at least 80% by weight of thermoplastic polyester.
29. The process as claimed in claim 28, wherein the polyester of the base layer (B) contains terephthalate units andor isophthalate units, and ethylene units.
30. The process as claimed in claim 26, wherein the polymer incompatible with polyester is a cycloolefin copolymer.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. Apparatus detachably connectable to a bicycle, said bicycle having a frame with front mounted handle means and rear mounted seat means, the bicycle having front and rear wheels secured thereto, the front wheel extending in front of the handle means, the rear wheel extending rearward from the seat means, each wheel having a corresponding axle extending therethrough, said apparatus comprising:
a sail attachment which when connected to the bicycle harnesses wind to drive the bicycle forward, said attachment adapted to fit on the rear of the bicycle above the rear wheel and securable to the seat means, said attachment being provided with a triangular wind receiving sail which when attached to the bicycle can harness wind 45 degrees from either the left or right side of the bicycle, wind 90 degrees from either side of the bicycle and at the rear of the bicycle to power the bicycle;
a U shaped member having two downwardly extending legs and an upper horizontal element extending therebetween with the legs being securable non-rotatably to the rear wheel axle;
a horizontal hollow tube open at both ends secured to said element, said tube being disposed at a right angle to said element;
a vertical hollow mast secured to the tube extending upwards therefrom;
a horizontal boom secured at one end to the mast adjacent the lower end of the mast;
said sail having an elongated vertical leg that is secured rotatably to the mast and a short horizontal leg secured rotatably to the boom; and
a boom haul extending along the hypotenuse of the sail and spaced therefrom, the boom haul being connected between the other end of the boom and the upper end of the mast.
2. The apparatus of claim 1 wherein one end of the tube is secured to the seat means to stabilize the structure when the apparatus is connected to the bicycle.
3. The apparatus of claim 2 further including a first line having a free end releasably connectable to the handle means and extending through the tube and connected to the boom.
4. The apparatus of claim 3 further including a second line having a free end releasably connectable to the seat means and extending through the tube and up the mast for connection to the sail.