A process for the production of a vinyl chloride-(meth)acrylate copolymer, C, by reacting a vinyl chloride monomer, A, and an alkyl (meth)acrylate monomer, B, said process comprising: A) In a first step: i) Providing a first mixture comprising vinyl chloride monomer, A, and alkyl (meth)acrylate monomer, B, in an aqueous medium in a reactor, wherein: a. the amount of B is between 20 and 100% of the total amount of B, b. the amount of A is between 15 and 80% of the total amount of A, and c. the weight ratio of A:B is 25:75 to 75:25; ii) Polymerising said first mixture, said polymerisation taking place by: a. heating the reactor to a temperature, T1, b. adding an initiator to start polymerisation, And wherein: c. where the amount of B at the start of the polymerisation is less than 100% of the total amount of B, the rest of B is added to the reactor in this first step after initiation of the polymerisation, d. where the amount of A at the start of the polymerisation is less than 80% of the total amount of A, optionally further monomer A is added to the reactor in this first step after initiation of the polymerisation, but with the proviso that the amount of monomer A added in this first step remains less than 80% of the total amount of A, and e. polymerisation is continued until at least 50% of the total amount of monomer B has reacted; B) In a second step: i) Adding the rest of monomer A to form a second mixture, and polymerising the second mixture. A) In a first step: i) Providing a first mixture comprising vinyl chloride monomer, A, and alkyl (meth)acrylate monomer, B, in an aqueous medium in a reactor, wherein: a. the amount of B is between 20 and 100% of the total amount of B, b. the amount of A is between 15 and 80% of the total amount of A, and c. the weight ratio of A:B is 25:75 to 75:25; ii) Polymerising said first mixture, said polymerisation taking place by: a. heating the reactor to a temperature, T1, b. adding an initiator to start polymerisation, And wherein: c. where the amount of B at the start of the polymerisation is less than 100% of the total amount of B, the rest of B is added to the reactor in this first step after initiation of the polymerisation, d. where the amount of A at the start of the polymerisation is less than 80% of the total amount of A, optionally further monomer A is added to the reactor in this first step after initiation of the polymerisation, but with the proviso that the amount of monomer A added in this first step remains less than 80% of the total amount of A, and e. polymerisation is continued until at least 50% of the total amount of monomer B has reacted; i) Providing a first mixture comprising vinyl chloride monomer, A, and alkyl (meth)acrylate monomer, B, in an aqueous medium in a reactor, wherein: a. the amount of B is between 20 and 100% of the total amount of B, b. the amount of A is between 15 and 80% of the total amount of A, and c. the weight ratio of A:B is 25:75 to 75:25; a. the amount of B is between 20 and 100% of the total amount of B, b. the amount of A is between 15 and 80% of the total amount of A, and c. the weight ratio of A:B is 25:75 to 75:25; ii) Polymerising said first mixture, said polymerisation taking place by: a. heating the reactor to a temperature, T1, b. adding an initiator to start polymerisation, And wherein: c. where the amount of B at the start of the polymerisation is less than 100% of the total amount of B, the rest of B is added to the reactor in this first step after initiation of the polymerisation, d. where the amount of A at the start of the polymerisation is less than 80% of the total amount of A, optionally further monomer A is added to the reactor in this first step after initiation of the polymerisation, but with the proviso that the amount of monomer A added in this first step remains less than 80% of the total amount of A, and e. polymerisation is continued until at least 50% of the total amount of monomer B has reacted; a. heating the reactor to a temperature, T1, b. adding an initiator to start polymerisation, c. where the amount of B at the start of the polymerisation is less than 100% of the total amount of B, the rest of B is added to the reactor in this first step after initiation of the polymerisation, d. where the amount of A at the start of the polymerisation is less than 80% of the total amount of A, optionally further monomer A is added to the reactor in this first step after initiation of the polymerisation, but with the proviso that the amount of monomer A added in this first step remains less than 80% of the total amount of A, and e. polymerisation is continued until at least 50% of the total amount of monomer B has reacted; B) In a second step: i) Adding the rest of monomer A to form a second mixture, and polymerising the second mixture. i) Adding the rest of monomer A to form a second mixture, and polymerising the second mixture.