TECHNOLOGY FOCUS - POLYMERS - Preferred Components: (I) is present at 80-97 wt.% in the polymer. The polymer contained in the polymer layer contains a repeating unit having at least one carboxyl group, a hydroxyl group or a (meth)acrylamide group at 0.03-20 wt.%. (I) is 1,1,2,2-tetrafluoroethylene, 1,1,2-trifluoro-2-chloro-ethylene or 1,1,2-trifluoro-2-trifluoromethyl-ethylene. The degree of crystallization of the polymer contained in the polymer layer is 30-95%. The polymer layer has a thickness of 1-20 mu m. The support contains at least one polyester resins, polycarbonate resins, polystyrene resins, acrylic resins or polyimide resins. The polymer contained in the aqueous polymer dispersion liquid has a core-shell structure in which each core portion is covered with a shell portion, where the core portion and the shell portion contains the polymer containing (I) at greater than or equal to 70 (preferably 80-97) wt.% and a repeating unit having at least one carboxyl group, a hydroxyl group or a (meth)acrylamide group at 0.01-30 wt.%. The mass ratio of the shell portion to the core portion is 0.1-0.4. Preferred Method: The method for producing the polymer sheet further comprises heating the polymer layer which has been formed by applying the aqueous polymer dispersion liquid onto the support at greater than or equal to 200 degrees C for greater than or equal to 5 seconds. EXAMPLE - Deionized water (3000 ml) was poured into a 6 l stainless steal autoclave equipped with a stirrer. The emulsifier was added so that the concentration reached 600 ppm, and then ammonium persulfate (APS) serving as an initiator was added so that the concentration reached 20 ppm. After the atmosphere inside autoclave was sufficiently substituted with nitrogen gas, tetrafluoroethylene (TFE) was press-fitted until the inside of the autoclave was 0.78 MPa. The components in the autoclave were heated to 70 degrees C to initiate polymerization. 18 hours later from the beginning of the polymerization, TFE was discharged, and then the temperature of the reaction system was decreased to 25 degrees C to stop the polymerization reaction. The resulting reaction product was filtered through a 400-mesh filter cloth to give polytetrafluoroethylene (PTFE) Latex (L-1). Pellets of a polyethylene terephthalate (PET) resin were dried to have a water content of less than or equal to 50 ppm. Separately, an UV absorber A was blended with the resin to prepare masterbatch pellets. The masterbatch pellets were dried to have a water content of less than or equal to 50 ppm. Two kinds of these pellets were mixed with each other and melted in an extruder with the temperature of a heater being set at 280-300 degrees C. The blend ratio was controlled so that the amount of the UV absorber A was 0.7 wt.% relative to the total mass of a completed support. The melted PET resin was discharged from a die section onto a chill roll to which electrostatic charged was applied to thereby obtain an amorphous film. Subsequently, the amorphous film was stretched 3.3 times in the longitudinal direction of the film and then stretched 3.8 times in the width direction of the film to thereby produce a biaxially stretched support having a thickness of 100 mu m. 25 The support formed of polyethylene terephthalate was subjected to, at its one surface, a corona treatment. Then, a polymer layer coating liquid was applied to the one surface of the support so that a wet coating amount was 34.5 cc/m2, followed by drying at 180 degrees C for 5 minutes to give support. Latex (L-1), SANDET BL (RTM: Anionic surfactant) (0.005 wt.%), NAROAKTY HN-100 (RTM: Polyoxyethylene alkyl ether) (0.005 wt.%) and distilled water were added into a 2l stainless steal vessel equipped with a stirrer, followed by a dispersion treatment to give a coating liquid. Subsequently, the support was wet-coated with the coating liquid by a bar coating method. The sample was heated by an infrared heater in a state where the back surface (the opposite surface to the surface provided with the polymer layer) of the sample was closely contacted with a cooling roll with the surface temperature being set to 70 degrees C so that the surface temperature became 330 degrees C. The heat treatment was performed in this state for 3 minutes to give a polymer sheet.